To provide a method for producing a metallic member having precise pattern in a reflection part by utilizing a stripped surface from a base material.

A resist having desirable pattern is stuck on the base material and a first metallic layer having the thickness equal to or less than that of the resist is formed with an electrocasting method etc., by bringing into contact with the surface of the base material, and a second metallic layer is formed with the electrocasting method etc., so as to cover the first metallic layer and the resist. This metallic member is produced by stripping or removing the base material and this resist from the metallic member, and any one of the first metallic layer and the second metallic layer exposed with the removal, is used as the reflection surface part, and the other side is used on the non-reflection surface part and these metallic layers are utilized as members for reflection type optical encoder.