In a hydraulic shock absorber 10 in which a piston rod 14 is inserted into an oil chamber 27 of a cylinder 13 provided in a damper case 11, and a damping force generating device 40 is provided between a piston side oil chamber 27A and a rod side oil chamber 27B of the cylinder 13, an outer flow path 13C communicating the piston side oil chamber 27A and the rod side oil chamber 27B is provided around the oil chamber 27 of the cylinder 13 in the damper case 11, and an oil reservoir chamber 32 is provided around the oil chamber 27 of the cylinder 13 in the damper case 11 and the outer flow path 13C.