To provide a control valve incapable of switching to finish without always operating with both hands, but capable of preventing an accident effectively.

The control valve 1 comprises an operating lever 2, a lock release button 3, and a lock mechanism 4 consisting of a rotor 41 connected to the operating lever 2 and a lock cylinder 42 connected to the lock release button 3. The rotor 41 comprises a first engaging portion 41a on the surface, and the lock cylinder 42 comprises a second engaging portion 42d to engage with the first engaging portion 41a. Only while the lock release button 3 is operated, the first and second engaging portions 41a and 42d are disengaged so as to be able to operate the operating lever 2.