diff --git a/store/db/mysql/memo_relation.go b/store/db/mysql/memo_relation.go
index b75c9b7c..d30fb926 100644
--- a/store/db/mysql/memo_relation.go
+++ b/store/db/mysql/memo_relation.go
@@ -40,6 +40,25 @@ func (d *DB) ListMemoRelations(ctx context.Context, find *store.FindMemoRelation
 	if find.Type != nil {
 		where, args = append(where, "`type` = ?"), append(args, find.Type)
 	}
+	if find.MemoFilter != nil {
+		// Parse filter string and return the parsed expression.
+		// The filter string should be a CEL expression.
+		parsedExpr, err := filter.Parse(*find.MemoFilter, filter.MemoFilterCELAttributes...)
+		if err != nil {
+			return nil, err
+		}
+		convertCtx := filter.NewConvertContext()
+		// ConvertExprToSQL converts the parsed expression to a SQL condition string.
+		if err := d.ConvertExprToSQL(convertCtx, parsedExpr.GetExpr()); err != nil {
+			return nil, err
+		}
+		condition := convertCtx.Buffer.String()
+		if condition != "" {
+			where = append(where, fmt.Sprintf("memo_id IN (SELECT id FROM memo WHERE %s)", condition))
+			where = append(where, fmt.Sprintf("related_memo_id IN (SELECT id FROM memo WHERE %s)", condition))
+			args = append(args, append(convertCtx.Args, convertCtx.Args...)...)
+		}
+	}
 
 	rows, err := d.db.QueryContext(ctx, "SELECT `memo_id`, `related_memo_id`, `type` FROM `memo_relation` WHERE "+strings.Join(where, " AND "), args...)
 	if err != nil {
diff --git a/store/db/postgres/memo_relation.go b/store/db/postgres/memo_relation.go
index 5b406035..4d12b771 100644
--- a/store/db/postgres/memo_relation.go
+++ b/store/db/postgres/memo_relation.go
@@ -46,6 +46,25 @@ func (d *DB) ListMemoRelations(ctx context.Context, find *store.FindMemoRelation
 	if find.Type != nil {
 		where, args = append(where, "type = "+placeholder(len(args)+1)), append(args, find.Type)
 	}
+	if find.MemoFilter != nil {
+		// Parse filter string and return the parsed expression.
+		// The filter string should be a CEL expression.
+		parsedExpr, err := filter.Parse(*find.MemoFilter, filter.MemoFilterCELAttributes...)
+		if err != nil {
+			return nil, err
+		}
+		convertCtx := filter.NewConvertContext()
+		// ConvertExprToSQL converts the parsed expression to a SQL condition string.
+		if err := d.ConvertExprToSQL(convertCtx, parsedExpr.GetExpr()); err != nil {
+			return nil, err
+		}
+		condition := convertCtx.Buffer.String()
+		if condition != "" {
+			where = append(where, fmt.Sprintf("memo_id IN (SELECT id FROM memo WHERE %s)", condition))
+			where = append(where, fmt.Sprintf("related_memo_id IN (SELECT id FROM memo WHERE %s)", condition))
+			args = append(args, append(convertCtx.Args, convertCtx.Args...)...)
+		}
+	}
 
 	rows, err := d.db.QueryContext(ctx, `
 		SELECT