By using the pressure of the air in the non-closed air chamber formed between the core member and the container as a pressure source for stimulating the penis and tightening force, the stimuli and tightening force can be varied due to appropriate pressure. An ejaculation promoting tool and an ejaculation promoting apparatus capable of obtaining the above are provided. A core main body (31) having an insertion port (33) and an insertion space (35), and a plurality of first ribs that protrude from the outer peripheral surface of the core main body at a required interval and extend in substantially the same direction. (40), and when the outer diameter of the core body expands, an air resistance member (50) that allows the passage of air along the flow path while providing resistance to the air flowing through the flow path F is provided.ペニスに対する刺激や締め付け力の元となる圧力源として、コア部材と容器との間に形成される非閉空気室内の空気の圧力を利用することによって、適正圧による変化に富んだ刺激、締め付け力を得ることができる射精促進具、及び射精促進装置を提供する。挿入口（３３）と挿入空所（３５）を備えたコア本体（３１）と、コア本体の外周面に所要の間隔を隔てて突設されて互いに略同方向へ延びる複数の第１のリブ（４０）と、を備え、コア本体の外径の膨張時には、流路Ｆを流れる空気に対する抵抗となりつつ該流路に沿った空気の通過を許容する空気抵抗部材（５０）を備えた。
