The invention relates to a liquid supply device utilizing a rotating cam mechanism for supplying a liquid. In the liquid supply device for smoothly supplying a liquid with the assistance of pressurizing action, switching operation by the rotating cam mechanism can be carried out reliably.
A liquid housing tube 14 housing a liquid is disposed to be movable in an axial direction in an outer shaft and has a tip end chip 32 movable between a protruding position from a tip end of the outer shaft and a retracting position in the outer shaft. A rotating cam mechanism 16 which can move the liquid housing tube 14 forward and backward includes a rotating cam 40 movable between a front position and a rear position and a pressurizing space 18 to be compressed to be able to pressurize an inside of the liquid housing tube 14 when the tip end chip 32 is in the protruding position is provided in a rear portion in the rotating cam 40.