Switch

To make it possible to provide a switch which can adjust ON/OFF switching positions easily and which can suppress wear to enhance the durability, there is provided an inhibitor switch for detecting the shift position of an automatic transmission. From a pole board, there are protruded insulator portions of an insulator having sliding faces on their surfaces. Sliding faces are provided with recesses for reducing facial pressures. When a moving contact slides with respect to a stationary contact to ON/OFF switching positions, the moving contact starts to ride on the insulator portions so that the moving contact goes out of contact with the stationary contact and can move from the sliding faces into the recesses. When the moving contact goes down the insulator portions, the moving contact contacts with the ON/OFF switching positions of the stationary contact.