To propose an excellent upright/invertedly jettable liquid jetting device which surely jets a liquid even when the liquid jetting device is upright or inverted and which has simple structure and can be formed by applying simple modification to the conventional pressure-accumulative liquid jetting device.

The upright/invertedly jettable liquid jetting device includes; a cylinder B2 having a first check valve 30 and a reflux hole 25 on the wall thereof; an actuating member B3 which is mounted on the cylinder B2 and has a pressure-accumulative discharge valve 52; a cylindrical adapter B4, the upper part of which is fit to the outer periphery of the cylinder B2, and which includes a second check valve 60 that blocks a flow of the liquid from the upstream side to the downstream side when the liquid jetting device is inverted, and in which a reflux passage 61 is arranged for communicating the reflux hole 25 with the space between the first check valve 30 and the second check valve 60; and such a reflux mechanism that when the liquid jetting device is upright, the liquid is supplied to the inside of the cylinder B2 through the second check valve 60 and the first check valve 30, when the liquid jetting device is inverted, the liquid is supplied to the inside of the cylinder B2 from an opening of the adapter B4 through the reflux passage 61 and the first check valve 30, and when the liquid jetting device is upright, a part of the liquid in the cylinder B2 is supplied to the reflux passage 61.