This atomization unit (111) is provided with a reservoir (11) that holds an aerosol source, an atomization part (13) that atomizes the aerosol source, and a cap body (16) that blocks a supply port for supplying the aerosol source to the reservoir, wherein movement of the cap body away from the reservoir causes the atomization part and/or a power supply member, which electrically connects a power source and the atomization part, to break.
