To provide a liquid pressure feeding device capable of preventing a coupling member from being detached from a U-shaped lever.

A working fluid introduction port 11, a working fluid exhaust port 13, a liquid flow port 16 and a liquid exhaust port 17 are provided in a closed container 2, and a lever float 6 and a selector valve 4 are built in the closed container 2. The lever float 6 comprises: a U-shaped lever 34 turnably mounted in the closed container 2; a bolt 64 as a coupling member fastened to a bridge part 3a of the U-shaped lever 34 by welding; a hooking shaft 66 as a hooking member penetrating the bolt 64 and hooked to opposed both side plates of the U-shaped lever 34; and a float 3 coupled with the bolt 64 and floating and dropping according to a liquid surface in the closed container 2. According to height of the surface of liquid stored in the closed container 2, first, an exhaust valve port 32 is opened and an air feeding valve port 24 is closed, so as to make the liquid flow from the liquid flow port 16. Then, the exhaust valve port 32 is closed and the air feeding valve port 24 is opened, so as to pressure-feed the liquid stored in the closed container 2 from the liquid exhaust port 17.