A plasma generation apparatus according to the present invention includes an electrode cell and a housing that encloses an electrode cell. The electrode cell includes a first electrode, a second electrode facing the first electrode with interposition of a discharge space therebetween, and dielectrics arranged on main surfaces of the electrodes. The plasma generation apparatus further includes a pipe passage configured to directly supply a source gas from the outside of the housing to the discharge space without being connected to a space within the housing where the electrode cell is not arranged.