diff --git a/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/Partner.java b/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/Partner.java
new file mode 100644
index 00000000..8bb6d387
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/Partner.java
@@ -0,0 +1,27 @@
+package com.example.sms.domain.model.master.partner;
+
+import lombok.AllArgsConstructor;
+import lombok.NoArgsConstructor;
+import lombok.Value;
+
+/**
+ * 取引先
+ */
+@Value
+@AllArgsConstructor
+@NoArgsConstructor(force = true)
+public class Partner {
+    String partnerCode; // 取引先コード
+    String partnerName; // 取引先名
+    String partnerNameKana; // 取引先名カナ
+    Integer supplierType; // 仕入先区分
+    String postalCode; // 郵便番号
+    String prefecture; // 都道府県
+    String address1; // 住所１
+    String address2; // 住所２
+    Integer tradeProhibitedFlag; // 取引禁止フラグ
+    Integer miscellaneousType; // 雑区分
+    String partnerGroupCode; // 取引先グループコード
+    Integer creditLimit; // 与信限度額
+    Integer temporaryCreditIncrease; // 与信一時増加枠
+}
diff --git a/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/PartnerList.java b/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/PartnerList.java
new file mode 100644
index 00000000..f6c33df6
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/PartnerList.java
@@ -0,0 +1,29 @@
+package com.example.sms.domain.model.master.partner;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * 取引先一覧
+ */
+public class PartnerList {
+    List<Partner> value;
+
+    public PartnerList(List<Partner> value) {
+        this.value = Collections.unmodifiableList(value);
+    }
+
+    public int size() {
+        return value.size();
+    }
+
+    public PartnerList add(Partner partner) {
+        List<Partner> newValue = value;
+        newValue.add(partner);
+        return new PartnerList(newValue);
+    }
+
+    public List<Partner> asList() {
+        return value;
+    }
+}
diff --git a/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/package-info.java b/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/package-info.java
new file mode 100644
index 00000000..afb7ac21
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/domain/model/master/partner/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * 取引先
+ */
+package com.example.sms.domain.model.master.partner;
\ No newline at end of file
diff --git a/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomEntity.java b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomEntity.java
new file mode 100644
index 00000000..3f196a17
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomEntity.java
@@ -0,0 +1,10 @@
+package com.example.sms.infrastructure.datasource.master.partner;
+
+import com.example.sms.infrastructure.datasource.autogen.model.取引先マスタ;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class PartnerCustomEntity extends 取引先マスタ {
+}
diff --git a/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomMapper.java b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomMapper.java
new file mode 100644
index 00000000..a33fd8f8
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomMapper.java
@@ -0,0 +1,16 @@
+package com.example.sms.infrastructure.datasource.master.partner;
+
+import org.apache.ibatis.annotations.Delete;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.List;
+
+@Mapper
+public interface PartnerCustomMapper {
+    PartnerCustomEntity selectByPrimaryKey(String partnerCode);
+
+    List<PartnerCustomEntity> selectAll();
+
+    @Delete("DELETE FROM public.取引先マスタ")
+    void deleteAll();
+}
diff --git a/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomMapper.xml b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomMapper.xml
new file mode 100644
index 00000000..df53d922
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerCustomMapper.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.example.sms.infrastructure.datasource.master.partner.PartnerCustomMapper">
+  <select id="selectByPrimaryKey" parameterType="java.lang.String" resultMap="com.example.sms.infrastructure.datasource.autogen.mapper.取引先マスタMapper.BaseResultMap">
+    select
+    <include refid="com.example.sms.infrastructure.datasource.autogen.mapper.取引先マスタMapper.Base_Column_List" />
+    from public.取引先マスタ
+    where 取引先コード = #{取引先コード,jdbcType=VARCHAR}
+  </select>
+
+  <select id="selectAll" parameterType="java.lang.String" resultMap="com.example.sms.infrastructure.datasource.autogen.mapper.取引先マスタMapper.BaseResultMap">
+    select
+    <include refid="com.example.sms.infrastructure.datasource.autogen.mapper.取引先マスタMapper.Base_Column_List" />
+    from public.取引先マスタ
+  </select>
+</mapper>
\ No newline at end of file
diff --git a/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerDataSource.java b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerDataSource.java
new file mode 100644
index 00000000..28237a56
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerDataSource.java
@@ -0,0 +1,8 @@
+package com.example.sms.infrastructure.datasource.master.partner;
+
+import com.example.sms.service.master.partner.PartnerRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class PartnerDataSource implements PartnerRepository {
+}
diff --git a/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerEntityMapper.java b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerEntityMapper.java
new file mode 100644
index 00000000..b09e18e6
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/PartnerEntityMapper.java
@@ -0,0 +1,7 @@
+package com.example.sms.infrastructure.datasource.master.partner;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class PartnerEntityMapper {
+}
diff --git a/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/package-info.java b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/package-info.java
new file mode 100644
index 00000000..7a02dc57
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/infrastructure/datasource/master/partner/package-info.java
@@ -0,0 +1 @@
+package com.example.sms.infrastructure.datasource.master.partner;
\ No newline at end of file
diff --git a/app/backend/api/src/main/java/com/example/sms/service/master/partner/PartnerRepository.java b/app/backend/api/src/main/java/com/example/sms/service/master/partner/PartnerRepository.java
new file mode 100644
index 00000000..0b5d2129
--- /dev/null
+++ b/app/backend/api/src/main/java/com/example/sms/service/master/partner/PartnerRepository.java
@@ -0,0 +1,4 @@
+package com.example.sms.service.master.partner;
+
+public interface PartnerRepository {
+}