A method of mixing two or more kinds of adhesive resin liquids takes the steps of arranging such that resin outlet ports (6a, 7a) of feed tubes (6, 7) for feeding two or more kinds of resin material liquids which are hardened by reaction face a side skin surface (3b) of an ultrasonic wave transmission solid horn (3), allowing the resin material liquids to flow down passing along the side skin surface (3b) while applying ultrasonic vibrations to the resin material liquids, and guiding the resin material liquids to a distal end face (3a) of the ultrasonic wave transmission solid horn (3), thereby mixing the resin material liquids in an aerial state.