A co-infusion apparatus is provided to prevent foaming of a transfusion when the transfusion is introduced into a medicine container, and to prevent the transfusion from directly hitting a medicine inside a vial. The co-infusion apparatus includes: a container holding section for holding a medicine container and tilting the medicine container a syringe holding section for holding a syringe, tilting the syringe, and varying an amount of insertion of a plunger of the syringe into a barrel of the syringe: and an insertion operation section for inserting a needle of the syringe through a mouth of the medicine container which is held by the container holding section, and inserting the needle of the syringe through a mixing port of a transfusion bag.
