Abstract: A hydraulic shock absorber includes: a dividing member dividing a closed space and having a communicating passage for communicating divided spaces; a valve covering an open end of the communicating passage; a bolt penetrating through the dividing member and the valve; and a nut fastening the dividing member and the valve together with the bolt. The bolt or the nut has a head fitted with an industrial tool, and a base end arranged on a valve side beyond the head to contact with the valve and including an extending part extending outside an outer shape of the head in a radial direction, a facing part of the base end facing the valve comes into contact with the valve at a position inside an outermost end of the extending part in the radial direction, and an outer region outside a contact part does not come into contact with the valve.