A front fork comprising: a vehicle-body-side tube and a wheel-side tube which are slidably engaged with each other in fitting engagement; a damper cylinder which is disposed upright in the inside and on the upper end portion of the vehicle-body-side tube; a piston rod which is disposed upright in the inside of wheel-side tube and is inserted into the inside of the damper cylinder; a main piston which is mounted on the piston rod such that the main piston is brought into slidable contact with an inner peripheral surface of the damper cylinder and partitions the inside of the damper cylinder into a rod-side oil chamber and a piston-side oil chamber, and has a damping force generating device; a sub piston which is mounted on a guide rod mounted in turn on the vehicle-body-side tube; wherein the sub piston is slidably disposed in the inside of the damper cylinder above the main piston, is brought into slidable contact with the inner peripheral surface of the damper cylinder, partitions the inside of the damper cylinder into the piston-side oil chamber and a sub tank chamber, and has a compression-side damping force generating device; a free piston which is disposed in the inside of the damper cylinder above the sub piston and pressurizes an oil chamber in the inside of the damper cylinder; and a sealing cap which is mounted on an opening portion below the damper cylinder, allows the piston rod to penetrate therethrough, and has a seal member which is brought into slidable contact with an outer periphery of the piston rod, and hermetically seals the oil chambers in the inside of the damper cylinder from the oil chamber outside the damper cylinder, wherein the piston rod includes a communication passage (31; 31a; 70, 71) which allows the oil chambers (43A, 43B) in the inside of the damper cylinder and the oil chamber outside the damper cylinder to be communicated with each other when the front fork assumes a predetermined extension position ranging from a ride-on stopping position to a fork maximum extended position. a vehicle-body-side tube and a wheel-side tube which are slidably engaged with each other in fitting engagement; a damper cylinder which is disposed upright in the inside and on the upper end portion of the vehicle-body-side tube; a piston rod which is disposed upright in the inside of wheel-side tube and is inserted into the inside of the damper cylinder; a main piston which is mounted on the piston rod such that the main piston is brought into slidable contact with an inner peripheral surface of the damper cylinder and partitions the inside of the damper cylinder into a rod-side oil chamber and a piston-side oil chamber, and has a damping force generating device; a sub piston which is mounted on a guide rod mounted in turn on the vehicle-body-side tube; wherein the sub piston is slidably disposed in the inside of the damper cylinder above the main piston, is brought into slidable contact with the inner peripheral surface of the damper cylinder, partitions the inside of the damper cylinder into the piston-side oil chamber and a sub tank chamber, and has a compression-side damping force generating device; a free piston which is disposed in the inside of the damper cylinder above the sub piston and pressurizes an oil chamber in the inside of the damper cylinder; and a sealing cap which is mounted on an opening portion below the damper cylinder, allows the piston rod to penetrate therethrough, and has a seal member which is brought into slidable contact with an outer periphery of the piston rod, and hermetically seals the oil chambers in the inside of the damper cylinder from the oil chamber outside the damper cylinder, wherein the piston rod includes a communication passage (31; 31a; 70, 71) which allows the oil chambers (43A, 43B) in the inside of the damper cylinder and the oil chamber outside the damper cylinder to be communicated with each other when the front fork assumes a predetermined extension position ranging from a ride-on stopping position to a fork maximum extended position.