A stylus support member extends in a first direction. A first and second elastic body attaching members are spaced aside from each other in a second direction are arranged spaced aside from the stylus support member in the first direction, and are connected to each other by first and second members. A first elastic body is arranged between a holder and the first elastic body attaching member. A second elastic body is arranged between a first member and the first elastic body attaching member. A third elastic body is arranged between a second member and the second elastic body attaching member. A fourth elastic body is arranged between the holder and the second elastic body attaching member. A detector detects displacement in the second direction of the stylus support member. The first to fourth elastic members perform lever motion of a single degree of freedom.