A priority flow control valve comprising: a housing in which a high pressure port, a steering port, and a loading/unloading port are formed; a spool for guiding hydraulic fluid, supplied from the high pressure port, to the steering port and the loading/unloading port, the spool being configured to be slidable in the housing; and a spring (13, 34) that biases the spool from a first position at which the hydraulic fluid is guided from the high pressure port to the steering port and the loading/unloading port to a second position at which the hydraulic fluid is guided from the high pressure port to the steering port, wherein with the priority flow control valve, the hydraulic fluid, supplied from the high pressure port, is supplied to the steering port with a higher priority, and an excess amount of the hydraulic fluid is supplied to the loading/unloading port, the priority flow control valve further comprising: a damper chamber formed in the housing; and a throttle check valve with which a flow path for the hydraulic fluid from the steering port to the damper chamber is throttled, the throttle check valve being provided between the steering port and the damper chamber, the throttle check valve opening a flow path for the hydraulic fluid from the damper chamber to the steering port, characterized in that: the priority flow control valve further comprises an opening member that establishes an opened state of the throttle check valve when the spool is at the second position. a housing in which a high pressure port, a steering port, and a loading/unloading port are formed; a spool for guiding hydraulic fluid, supplied from the high pressure port, to the steering port and the loading/unloading port, the spool being configured to be slidable in the housing; and a spring (13, 34) that biases the spool from a first position at which the hydraulic fluid is guided from the high pressure port to the steering port and the loading/unloading port to a second position at which the hydraulic fluid is guided from the high pressure port to the steering port, wherein with the priority flow control valve, the hydraulic fluid, supplied from the high pressure port, is supplied to the steering port with a higher priority, and an excess amount of the hydraulic fluid is supplied to the loading/unloading port, the priority flow control valve further comprising: a damper chamber formed in the housing; and a throttle check valve with which a flow path for the hydraulic fluid from the steering port to the damper chamber is throttled, the throttle check valve being provided between the steering port and the damper chamber, the throttle check valve opening a flow path for the hydraulic fluid from the damper chamber to the steering port, characterized in that: the priority flow control valve further comprises an opening member that establishes an opened state of the throttle check valve when the spool is at the second position. a damper chamber formed in the housing; and a throttle check valve with which a flow path for the hydraulic fluid from the steering port to the damper chamber is throttled, the throttle check valve being provided between the steering port and the damper chamber, the throttle check valve opening a flow path for the hydraulic fluid from the damper chamber to the steering port, characterized in that: the priority flow control valve further comprises an opening member that establishes an opened state of the throttle check valve when the spool is at the second position.