PURPOSE: To establish a method for certain pasteurization with quick temp. rise by irradiating connected terminals with microwaves, giving intermolecular directly to the composition of a dialytic liquid between the terminals, and thereby causing a rise of the temp.

CONSTITUTION: Tubes 4, 6 constituting a transfusion liquid line are clamped 8, 8 in the neighborhood of a pair of connection terminals 5, 7 before the transfusion liquid is fed to a transfusion liquid line which is on the way coupled by the connection terminals 5, 7, and these terminals 5, 7 coupled together are accommodated in a hollow waveguide pipe 1, and microwaves 3 oscillated from a magnetron 2 in the waveguide pipe 1 are cast between the clamps 8, 8 including the terminals 5, 7, and thereby the transfusion liquid within the terminals 5, 7 is heated and pasteurized.