Damping force controlling shock absorber

A damping force controlling shock absorber comprising:

• a cylinder formed in a double structure of an inside and an outside, having an internal space divided into a compression chamber and a rebound chamber by a piston valve, and having a reservoir chamber in an external space;
• a compression solenoid valve mounted on the cylinder;
• a rebound solenoid valve mounted on the cylinder;
• and
• a check valve disposed in the rebound solenoid valve, and opening and closing a channel connecting the reservoir chamber and the rebound chamber,
• wherein, in a compression stroke, a portion of fluid in the compression chamber is sent to the reservoir chamber through the compression solenoid valve, and a portion of fluid in the reservoir chamber is sent to the rebound chamber through the channel due to opening of the check valve, and
• a portion of fluid in the rebound chamber is sent to the compression chamber through the rebound solenoid valve and the compression solenoid valve in a rebound stroke.