Driver and driver-integrated electric actuator

Provided are a driver and a driver-integrated electric actuator, with which it is possible to minimize increases in the temperature of a driver integrated with an electric actuator. A driver circuit of a driver 15 integrated with an electric actuator controls the current supplied to an electric actuator 20. A metal member 16 (a heat-conducting part) conducts heat produced by the driver circuit. A driver sealing part 4, which is fixed to the electric actuator 20, seals the driver circuit and the metal member 16. The metal member 16 is extended to the electric actuator 20.