a spool valve device includes a valve body (B), an actuator port (34, 35), a spool (37), a supply passage (33), and a regeneration flow passage (45) formed in the spool (37). An inflow port (46) of the regeneration flow passage (45) always communicates with the actuator port (35), when the spool (37) is placed at a regeneration switching position where a predetermined moving amount from a neutral position is ensured, the outflow port (47) of the regeneration flow passage (45) communicates with the actuator port (34) through the supply passage (33), and when the spool (37) is placed at a position other than the regeneration switching position, the communication between the outflow port (47) and the actuator port (34) is blocked.