Liquid supply device

A liquid supply device which supplies liquid stored in a tank to a target object, comprising:

• a cylinder having both end portions closed;
• a piston which comparts an inner space of the cylinder into a first space and a second space, and is relatively slidable on an inner wall surface of the cylinder;
• a piston rod which extends to penetrate one of the end portions of the cylinder and has a tip end portion connected to the piston;
• a frame member to which a portion of the piston rod which is located outside the cylinder is fastened;
• a drive section which causes the cylinder to reciprocate in a direction in which the piston rod extends;
• a first flow line which is in communication with the tank and with the first space to flow the liquid therethrough;
• and
• a second flow line which is in communication with the tank and with the second space to flow the liquid therethrough,
• wherein the first flow line includes a first supply line provided on a line connecting the tank to the first space, and a first discharge line provided on a line connecting the first space to the target object, and
• wherein the second flow line includes a second supply line provided on a line connecting the tank to the second space, and a second discharge line provided on a line connecting the second space to the target object.