To provide a portable infusion apparatus which can be transferred to keep an infusion bag in the stable state for providing safe infusion.

This portable infusion apparatus holds the infusion bag and comprises a bag pressurizing means for pressurizing the infusion bag to flow out infusion liquid, an air supplying means for supplying the bag pressurizing means with pressurizing air, and a board holder for supporting the bag pressurizing means from the backside, wherein the bag pressurizing means comprises a pressurizing bag, a board material set on the rear side of the pressuring bag for allowing only the front side of the pressuring bag to expand, and a sheet material fixed to both the ends of the pressurizing bag for supporting the infusion bag between the pressurizing bag and the sheet material; and the board material in the pressurizing bag means is detachably fixed to the holder.