To provide a changeover valve for a fluid pressure apparatus which can be easily manufactured, assembled and incorporated into piping, and of which the maintenance is easy. For this purpose, there are provided a supply body 1 having a supply passage 8 extending from an introduction port 6 of fluid under pressure to a supply port 30a of a fluid pressure apparatus 30, an exhaust body 2 having an exhaust passage 9 extending from the exhaust port 30 of the fluid pressure apparatus 30 to a fluid exhaust port 7, and a retainer 3 being provided between the supply body 1 and the exhaust body 2 and having a passageway 10 communicating the supply passage 8 with the exhaust passage 9, a valve member 4 opening and closing a valve seat 12 provided in the passage way 10 and a valve seat 11 provided in the supply passage 8 of the supply body 1, and operating means 5 manually opening and closing the valve member 4.