A hydraulic shock absorber for a vehicle, comprising: an outer tube; an inner tube which is inserted movably inside the outer tube; a ring-shaped oil chamber which is formed by a plurality of dividing members (20, 11A) which divide a space formed by an inner circumference of the outer tube and an outer circumference of the inner tube, in an axial direction; a partition wall member which is installed in an open side end section of the inner tube and which divides an internal space of the inner tube into an oil reservoir chamber and a hydraulic oil chamber along the axial direction; an abutting surface which projects in a radial direction from an outer circumference of the partition wall member and which abuts against an open side end surface of the inner tube in a state that the partition wall member is installed on the inner tube; a piston rod which is installed on the outer tube and which passes through the partition wall member and reaches into the hydraulic oil chamber, a cross-sectional area of the ring-shaped oil chamber being set to be larger than a cross-sectional area of the piston rod; a piston which is provided on a hydraulic oil chamber side of the piston rod and which slides in contact with an inner circumference of the inner tube, the piston dividing the hydraulic oil chamber into a piston rod side oil chamber and a piston side oil chamber; and an oil hole which is provided in the inner tube and connects between the ring-shaped oil chamber and the piston rod side oil chamber, wherein the partition wall member is installed on the inner tube by screw coupling of a thread section formed in a prescribed range in the axial direction on the outer circumference of the partition wall member, and a thread section formed in a prescribed range in the axial direction on the inner circumference of the inner tube, characterized in that the hydraulic shock absorber further comprises: a ring-shaped flow passage formed continuously along a circumferential direction between the outer circumference of the partition wall member and the inner circumference of the inner tube, in a range from the abutting surface to a screw coupling starting portion of the thread section of the inner tube; an outer side flow passage which is formed to a ring-shaped oil chamber side from the dividing member positioned on an open end surface side of the inner tube and which connects the ring-shaped oil chamber and the ring-shaped flow passage, an inner side flow passage which is formed in the partition wall member and which connects the ring-shaped flow passage and the oil reservoir chamber. an outer tube; an inner tube which is inserted movably inside the outer tube; a ring-shaped oil chamber which is formed by a plurality of dividing members (20, 11A) which divide a space formed by an inner circumference of the outer tube and an outer circumference of the inner tube, in an axial direction; a partition wall member which is installed in an open side end section of the inner tube and which divides an internal space of the inner tube into an oil reservoir chamber and a hydraulic oil chamber along the axial direction; an abutting surface which projects in a radial direction from an outer circumference of the partition wall member and which abuts against an open side end surface of the inner tube in a state that the partition wall member is installed on the inner tube; a piston rod which is installed on the outer tube and which passes through the partition wall member and reaches into the hydraulic oil chamber, a cross-sectional area of the ring-shaped oil chamber being set to be larger than a cross-sectional area of the piston rod; a piston which is provided on a hydraulic oil chamber side of the piston rod and which slides in contact with an inner circumference of the inner tube, the piston dividing the hydraulic oil chamber into a piston rod side oil chamber and a piston side oil chamber; and an oil hole which is provided in the inner tube and connects between the ring-shaped oil chamber and the piston rod side oil chamber, wherein the partition wall member is installed on the inner tube by screw coupling of a thread section formed in a prescribed range in the axial direction on the outer circumference of the partition wall member, and a thread section formed in a prescribed range in the axial direction on the inner circumference of the inner tube, characterized in that the hydraulic shock absorber further comprises: a ring-shaped flow passage formed continuously along a circumferential direction between the outer circumference of the partition wall member and the inner circumference of the inner tube, in a range from the abutting surface to a screw coupling starting portion of the thread section of the inner tube; an outer side flow passage which is formed to a ring-shaped oil chamber side from the dividing member positioned on an open end surface side of the inner tube and which connects the ring-shaped oil chamber and the ring-shaped flow passage, an inner side flow passage which is formed in the partition wall member and which connects the ring-shaped flow passage and the oil reservoir chamber.