To provide an invertible pump dispenser capable of sufficiently ensuring the discharge amount of a liquid at the time of use in an inverted state and capable of preventing the generation of a dissonance.

In the invertible pump dispenser 14 attached to the mouth part of a container, which contains 0.05-60% of a surfactant and of which the liquid viscosity at 25°C is 1-100 cp, and capable of pouring the housed liquid in upright and inverted states, the dip tube 26 (the pipeline used in an upright state) extending into the container from the main body of the dispenser 14 is branched from a branch point 50a to be connected to an upright and inverted state changeover member 50 and the minimum cross-sectional area of the pipeline from the ball valve seat 22a of the main body of the dispenser to the branch part 50a of the upright and inverted state changeover member 50 is set to 3.0 mm2 or more.