A flush toilet is provided with a toilet main unit and a functional unit. The toilet main unit has a toilet bowl and an upper surface portion on which a recessed portion is formed. The functional unit is provided on the rear side of the toilet bowl and offers a function different from a function for washing the toilet bowl. The functional unit is able to move between an entering position where at least a portion of the functional unit is located inside the recessed portion and a retreating position where the entire functional unit is located outside the recessed portion.