PROBLEM TO BE SOLVED: To provide a sterilizing device capable of sterilizing a container with stable sterilizing power by using sterilizing gas. A container sterilizer (1) according to the present invention includes a pipe (51) through which a sterilizing gas (SG) flows, an outlet (53) penetrating the front and back of the pipe (51), and an outlet (53). ), and a blow-out tube (55) projecting outward in the radial direction of the pipe (51). The sterilizer (1) satisfies the following equations (1) and (2). 2d ≤ L ≤ 4d (1) 1 ≤ Ao/Ai ≤ 3 (2) d: Opening diameter of blowout port (53) L: Projection length of blowout tube (55) Ai: Opening area of blowout tube (55) Ao: Difference between the opening area Ai and the opening area of the drinking mouth (103) of the container (100) [Selection diagram] FIG.【課題】殺菌性ガスを用いて容器を安定した殺菌力で殺菌できる殺菌装置を提供すること。【解決手段】本発明の容器の殺菌装置（１）は、殺菌性ガス（ＳＧ）が流れる配管（５１）と、配管（５１）の表裏を貫通する吹出口（５３）と、吹出口（５３）に連なり、配管（５１）の径方向の外側に向けて突出する吹出筒（５５）と、を備える。殺菌装置（１）は、以下の式（１）および式（２）を満たす。 ２ｄ≦Ｌ≦４ｄ…（１） １≦Ａｏ／Ａｉ≦３…（２） ｄ：吹出口（５３）の開口径 Ｌ：吹出筒（５５）の突出長 Ａｉ：吹出筒（５５）の開口面積 Ａｏ：開口面積Ａｉと容器（１００）の飲み口（１０３）の開口面積の差分【選択図】図１
