A control valve for selectively supplying a fluid to one of an advanced angle chamber (Ca) and a retarded angle chamber (Cb) formed between a driving side rotation member synchronously rotating with a crankshaft of an internal combustion engine and a driven side rotation member integrally rotating with a camshaft of the internal combustion engine, the driven side rotation member relatively rotating to the driving side rotation member, the control valve for supplying a fluid for unlocking a lock member checking a relative rotation of the driving side rotation member and the driven side rotation member, the control valve comprising: a valve case; a spool accommodated in the valve case; an electromagnetic solenoid operating the spool along a spool axis extending in a longitudinal direction; the valve case including a pump port to which a fluid is supplied, an advanced angle port configured to be in communication with the advanced angle chamber (Ca), a retarded angle port configured to be in communication with the retarded angle chamber (Cb), and an unlocking port configured to be in communication with the lock member; the spool being operated to at least five positions including a first advanced angle position where the fluid is supplied to the advanced angle port and the unlocking port, a second advanced angle position where the fluid is supplied only to the advanced angle port, an unlock position where the fluid is supplied only to the unlocking port, a first retarded angle position where the fluid is supplied to the retarded angle port and the unlocking port, and a second retarded angle position where the fluid is supplied only to the retarded angle port; and a lock control fluid passage formed inside the spool in an attitude along the spool axis, the lock control fluid passage allowing the fluid from the pump port to be supplied only to the unlocking port irrespective of the position of the spool when the spool is operated to any one of the positions at which the fluid is supplied from the pump port to the unlocking port. a valve case; a spool accommodated in the valve case; an electromagnetic solenoid operating the spool along a spool axis extending in a longitudinal direction; the valve case including a pump port to which a fluid is supplied, an advanced angle port configured to be in communication with the advanced angle chamber (Ca), a retarded angle port configured to be in communication with the retarded angle chamber (Cb), and an unlocking port configured to be in communication with the lock member; the spool being operated to at least five positions including a first advanced angle position where the fluid is supplied to the advanced angle port and the unlocking port, a second advanced angle position where the fluid is supplied only to the advanced angle port, an unlock position where the fluid is supplied only to the unlocking port, a first retarded angle position where the fluid is supplied to the retarded angle port and the unlocking port, and a second retarded angle position where the fluid is supplied only to the retarded angle port; and a lock control fluid passage formed inside the spool in an attitude along the spool axis, the lock control fluid passage allowing the fluid from the pump port to be supplied only to the unlocking port irrespective of the position of the spool when the spool is operated to any one of the positions at which the fluid is supplied from the pump port to the unlocking port.