diff --git a/CHANGELOG.md b/CHANGELOG.md
index e00026e5d3..970feee5e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -79,6 +79,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/auth,bank,foundation,wasm) [\#691](https://github.com/line/lbm-sdk/pull/691) change AccAddressFromBech32 to MustAccAddressFromBech32
 * (x/wasm) [\#690](https://github.com/line/lbm-sdk/pull/690) fix to prevent accepting file name
 * (cli) [\#708](https://github.com/line/lbm-sdk/pull/708) In CLI, allow 1 SIGN_MODE_DIRECT signer in transactions with multiple signers.
+* (x/bank) [\#716](https://github.com/line/lbm-sdk/pull/716) remove useless DenomMetadata key function
+
 
 ### Bug Fixes
 * (x/wasm) [\#453](https://github.com/line/lbm-sdk/pull/453) modify wasm grpc query api path
diff --git a/go.sum b/go.sum
index 320244f8c9..7884744d35 100644
--- a/go.sum
+++ b/go.sum
@@ -909,7 +909,6 @@ github.com/spf13/cast v1.5.0/go.mod h1:SpXXQ5YoyJw6s3/6cMTQuxvgRl3PCJiyaX9p6b155
 github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
 github.com/spf13/cobra v0.0.5/go.mod h1:3K3wKZymM7VvHMDS9+Akkh4K60UwM26emMESw8tLCHU=
 github.com/spf13/cobra v1.1.1/go.mod h1:WnodtKOvamDL/PwE2M4iKs8aMDBZ5Q5klgD3qfVJQMI=
-github.com/spf13/cobra v1.5.0 h1:X+jTBEBqF0bHN+9cSMgmfuvv2VHJ9ezmFNf9Y/XstYU=
 github.com/spf13/cobra v1.5.0/go.mod h1:dWXEIy2H428czQCjInthrTRUg7yKbok+2Qi/yBIJoUM=
 github.com/spf13/cobra v1.6.0 h1:42a0n6jwCot1pUmomAp4T7DeMD+20LFv4Q54pxLf2LI=
 github.com/spf13/cobra v1.6.0/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
diff --git a/x/bank/keeper/keeper.go b/x/bank/keeper/keeper.go
index ee0ade08fa..d993fb7a9f 100644
--- a/x/bank/keeper/keeper.go
+++ b/x/bank/keeper/keeper.go
@@ -252,7 +252,7 @@ func (k BaseKeeper) HasSupply(ctx sdk.Context, denom string) bool {
 // false otherwise.
 func (k BaseKeeper) GetDenomMetaData(ctx sdk.Context, denom string) (types.Metadata, bool) {
 	store := ctx.KVStore(k.storeKey)
-	store = prefix.NewStore(store, types.DenomMetadataKey(denom))
+	store = prefix.NewStore(store, types.DenomMetadataPrefix)
 
 	bz := store.Get([]byte(denom))
 	if bz == nil {
@@ -299,7 +299,7 @@ func (k BaseKeeper) IterateAllDenomMetaData(ctx sdk.Context, cb func(types.Metad
 // SetDenomMetaData sets the denominations metadata
 func (k BaseKeeper) SetDenomMetaData(ctx sdk.Context, denomMetaData types.Metadata) {
 	store := ctx.KVStore(k.storeKey)
-	denomMetaDataStore := prefix.NewStore(store, types.DenomMetadataKey(denomMetaData.Base))
+	denomMetaDataStore := prefix.NewStore(store, types.DenomMetadataPrefix)
 
 	m := k.cdc.MustMarshal(&denomMetaData)
 	denomMetaDataStore.Set([]byte(denomMetaData.Base), m)
diff --git a/x/bank/types/key.go b/x/bank/types/key.go
index 89ee5e17d3..db9d88819a 100644
--- a/x/bank/types/key.go
+++ b/x/bank/types/key.go
@@ -29,12 +29,6 @@ var (
 	DenomMetadataPrefix = []byte{0x1}
 )
 
-// DenomMetadataKey returns the denomination metadata key.
-func DenomMetadataKey(denom string) []byte {
-	d := []byte(denom)
-	return append(DenomMetadataPrefix, d...)
-}
-
 // AddressFromBalancesStore returns an account address from a balances prefix
 // store. The key must not contain the prefix BalancesPrefix as the prefix store
 // iterator discards the actual prefix.