The present invention provides a clutch connection controller, a clutch connection control method and a riding vehicle, capable of flexibly coping with operation of a vehicle by an occupant by connecting a clutch at speed corresponding to change of difference in rotational speed of the clutch during clutch connection operation. In this clutch controller for connecting or disconnecting the clutch by operation of a clutch actuator (41), a main microcomputer (1) includes a clutch rotational speed difference computing part (12) for detecting difference in rotational speed of the clutch which is difference in rotational speed between a driving side and a driven side of the clutch, a clutch connection speed changing part (14) for obtaining clutch connection speed in accordance with difference in rotational speed of the clutch detected by the clutch rotational speed difference computing part (12), and a clutch connection operation part (16) for bringing the driving side and the driven side of the clutch close for each other at the clutch connection speed.