A component mounting apparatus has an intermittently rotated rotary mounting section which has a driver at an upper part for driving motors of mounting heads arranged on periphery of the rotary mounting section. A controller in a stationary part of the apparatus inputs power and control signals to the rotating driver which is formed in an annular shape, and includes motor driver mounting plates with motor drivers for controlling power supplied to each motor. The motor driver mounting plates are arranged radially around a rotation axis of the rotating driver with planar surfaces in parallel to the rotation axis.