Disclosed are briefs (10), sanitary napkin briefs (91) and a sanitary product set. The briefs (10) comprise a first waist area (1), a crotch area (2) and a second waist area (3), a first fixing structure (4) and a second fixing structure (5) being arranged between the first waist area (1) and the second waist area (3), and one side of the first waist area (1) being detachably connected to the second waist area (3) by means of the first fixing structure (4). According to the briefs (10), the first waist area (1) and the second waist area (3) are detachably connected by means of the first fixing structure (4) and the second fixing structure (5), such that the briefs can be switched between a trousers-type state and a plane state to facilitate a user in putting on and taking off the briefs, the user can replace the briefs (10) without taking off their trousers, the usage by the user is significantly facilitated, and the requirements of the user are met.
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