Syringe assembly, syringe assembly package body, and pre-filled syringe

A syringe assembly comprising:

• 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 formed at a proximal end of the annular head portion, and
• a puncture needle having a puncture needle tip at a distal end of the puncture needle 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 positioned distally from the open proximal end 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, the puncture needle storage portion configured to store the puncture needle,
• an insertion portion configured to receive the puncture needle tip of the puncture needle stored in the puncture needle storage portion, and
• a projection portion formed on an inner surface of the barrel end storage portion,
• wherein the projection portion has a top portion and a distal inclined portion extending distally from the top portion and having a projection height that decreases in a distal direction from the top portion, and
• wherein the syringe assembly is configured such that, when the barrel end portion of the barrel is mounted in the seal cap, the puncture needle tip is inserted into the insertion portion of the seal cap, the projection portion of the seal cap and the annular recessed portion of the barrel end portion are engaged with each other, and the distal inclined portion is hermetically pressed against an outer surface of the annular head portion.