Hydraulic shock absorber

A hydraulic shock absorber comprising:

• a cylinder tube having a first end wall and a second end wall at both ends thereof in a direction of an axial line, and also having an intermediate wall between these both end walls;
• a piston chamber and an adjusting chamber, which are formed between the intermediate wall and the first end wall and between the intermediate wall and the second end wall, respectively, so as to mutually communicate through a communicating part formed at the intermediate wall;
• oil sealed inside the piston chamber and the adjusting chamber in a pressurized state;
• a pressure control member which pressurizes the oil by operation from outside so as to increase pressurizing force of the oil that lowers due to reduction of an amount of the oil caused by operation of the shock absorber;
• a piston which moves in the direction of the axial line with a gap maintained through which the oil flows between an inner periphery of the piston chamber and an outer periphery of the piston in the inside of the piston chamber;
• a rod mounted on the piston to extend through the intermediate wall, the adjusting chamber and the second end wall, a leading end of which is introduced to the outside of the cylinder tube;
• and
• an elastic member which varies a volume thereof by action of a hydraulic pressure and which is arranged in the adjusting chamber, and compressed by pressurizing force of the oil in an initial state where the rod resides at a non-operating position so as to form a reservoir tank in the adjusting chamber due to a space created by compression, the elastic member being extended and contracted elastically based on flowing in/flowing out of the oil into/from the reservoir tank accompanied by the operation of the rod.