To provide a high pressure forced feeding device with a distributor constituting group 2 and with an operation unit 14 for a control part 21 movable in a valve element constituting group 13, the operation unit 14 having a high pressure chamber 11 partitioned with a bush 4 encircling a distributing piston 10 and the valve element constituting group 13 for an improved high pressure loaded form to achieve sealing operation withstanding against a high load without using additional sealing members.

Planes forming a variety of geometric sealing surfaces 38 are provided on an end face side 5 of the bush 4 directed to the high pressure chamber 11 and on an end face side 48 of the valve element constituting group 13 directed to the high pressure chamber 11.