Abstract: A closure body includes a closure member and a sealing member formed on closure member. The closure member includes a closure end, an accommodation end extending downward from closure end, an e-liquid passage running through closure end and extending to accommodation end, and an air passage separated from e-liquid passage. The air passage includes a connection air passage running through top of closure end, a longitudinal air passage longitudinally running through closure end and communicating with connection air passage, and an outer-side air passage extending from outer edge of longitudinal air passage to accommodation end. A notch is formed in middle of accommodation end. The sealing member includes a first sealing portion—formed at accommodation end, a second sealing portion extending from first sealing portion toward closure end, and a third sealing portion formed at periphery of top of closure end and integrated with second sealing portion.