A deflector which deflects a charged particle beam includes a substrate having an opening through which the charged particle beam should pass, and a deflection electrode which is arranged in the opening to deflect the charged particle beam and has a first conductive member and second conductive member, which are formed by plating. The second conductive member is formed on the surface of the first conductive member and is made of a material that is more difficult to oxidize than the first conductive member. The first conductive member is made of a material having smaller residual stress than the second conductive member.