A handy terminal for a wind turbine generator which the maintenance of the wind turbine generator, especially the maintenance work inside the nacelle, can be simplified while considering the safety of the maintenance operator. The handy terminal comprises a tower provided to stand on land or off-shore, a nacelle supported on the tower to be controlled to rotate in the yaw direction and a plurality of rotatable blades attached to the nacelle to be controlled to move their pitch, whereby the handy terminal is connectable to connecting ends respectively provided on the lower portion of the tower and the nacelle so as to perform various control of the wind turbine generator.