A front fork, comprising: a body side tube which is connected to a body of a saddle-ridden vehicle; an axle side tube which is connected to an axle of the saddle-ridden vehicle and is slidably fitted to the body side tube to form a spacer inside together with the body side tube; a damper which includes an extension side chamber compressed at the time of extension and a compression side chamber compressed at the time of contraction inside, is interposed between the body side tube and the axle side tube and is housed in the space; a reservoir which is provided inside the space and outside the damper; a damping force adjusting flow passage which allows communication between the compression side chamber or the extension side chamber as an upstream side and the reservoir as a downstream side, characterized in that the front fork comprises a solenoid valve which includes a spool housing portion provided at an intermediate position of the damping force adjusting flow passage, a spool valve inserted into the spool housing portion movably in an axial direction and a solenoid driving the spool valve in the axial direction, and is configured to adjust a flow passage area of the damping force adjusting flow passage; wherein: pressure receiving areas on opposite axial sides of the spool valve on which a pressure in an upstream side of the damping force adjusting flow passage acts are made equal; and an upper arrangement passage which is arranged at least higher than an upper end of the spool housing portion is provided in a downstream side of the damping force adjusting flow passage. a body side tube which is connected to a body of a saddle-ridden vehicle; an axle side tube which is connected to an axle of the saddle-ridden vehicle and is slidably fitted to the body side tube to form a spacer inside together with the body side tube; a damper which includes an extension side chamber compressed at the time of extension and a compression side chamber compressed at the time of contraction inside, is interposed between the body side tube and the axle side tube and is housed in the space; a reservoir which is provided inside the space and outside the damper; a damping force adjusting flow passage which allows communication between the compression side chamber or the extension side chamber as an upstream side and the reservoir as a downstream side, characterized in that the front fork comprises a solenoid valve which includes a spool housing portion provided at an intermediate position of the damping force adjusting flow passage, a spool valve inserted into the spool housing portion movably in an axial direction and a solenoid driving the spool valve in the axial direction, and is configured to adjust a flow passage area of the damping force adjusting flow passage; wherein: pressure receiving areas on opposite axial sides of the spool valve on which a pressure in an upstream side of the damping force adjusting flow passage acts are made equal; and an upper arrangement passage which is arranged at least higher than an upper end of the spool housing portion is provided in a downstream side of the damping force adjusting flow passage. pressure receiving areas on opposite axial sides of the spool valve on which a pressure in an upstream side of the damping force adjusting flow passage acts are made equal; and an upper arrangement passage which is arranged at least higher than an upper end of the spool housing portion is provided in a downstream side of the damping force adjusting flow passage.