PURPOSE: To save parts and assembly cost by providing an automatic clutch working operator having an inlet connected to a reserver and an outlet connected to a clutch actuator of standard specifications and constituting it so that it responds to a command signal from a control device.

CONSTITUTION: An automatic clutch operator 30 is provided between a master cylinder 104 and a clutch actuator 110 of a current standard manual clutch control device so as to form an automatic clutch. This clutch operator 30 is directly or indirectly controlled by command output from a CPU. The actuator 30 also includes an inlet 120 connected to a reserver 102 by a pipe 112 and an outlet 122 connected to the standard clutch actuator 110 by a pipe 116. Thereafter, when either of the master cylinder 104 and the actuator works, fluid connection against the upstream side is blocked. On three pedal device 3, a clutch control device 100 is actuated by either of the pedal 3 and the CPU.