A syringe assembly includes a barrel including a barrel body portion, a cylindrical barrel end portion disposed at a distal end of the barrel body portion, the cylindrical barrel end portion including an annular head portion and an annular recessed portion, and a puncture needle having a puncture needle tip and having a proximal end fixedly inserted into the barrel end portion and a seal cap mounted to the barrel, the seal cap including a closed distal end portion, an open proximal end portion, a hollow portion including (i) a barrel end storage portion, the barrel end storage portion being configured to store the barrel end portion, and (ii) a puncture needle storage portion extending from a distal end of the barrel end storage portion, an insertion portion configured to receive the puncture needle tip, and a projection portion formed on an inner surface of the barrel end storage portion.
