The present invention provides an atomization unit containing: a liquid retaining member for retaining aerosol source； a heater for atomizing the aerosol source retained in the liquid retaining member； and a covering member for restraining the provided amount of the aerosol source to the liquid retaining member. The liquid retaining member has a shape elongated in a predetermined direction, and at least one portion of the inner surface of the liquid retaining member is in contact with or close to the heater in an orthogonal direction orthogonal to the predetermined direction. The at least one portion of the inner surface of the liquid retaining member is covered by the covering member.本發明提供一種霧化單元，係具有：保持氣膠源之液體保持構件；將由前述液體保持構件所保持之前述氣膠源予以霧化之發熱體；以及限制前述氣膠源對於前述液體保持構件之供給量的被覆構件；前述液體保持構件係具有沿著預定方向延伸之形狀，在與前述預定方向正交之正交方向中的前述液體保持構件之內側側面的至少一部分係與前述發熱體接觸或接近，前述正交方向中之前述液體保持構件的外側側面之至少一部分，係由前述被覆構件所被覆。
