To provide a multipass cell permitting a reduction in a volume of an inner space into which sample gas is introduced, there are provided: a cell main body with the inner space into which the sample gas is introduced; and a pair of mirrors provided oppositely to each other in the inner space, wherein light incident from an incidence window of the cell main body is subjected to multireflection between the pair of mirrors and is emitted from an emission window of the cell main body, wherein: each of the mirrors is shaped such that light spots formed on a reflecting surface of each of the mirrors are scattered in an elongated region of a predetermined width through the light multireflection; and each of the mirrors is formed into an elongated shape along a longitudinal direction of the elongated region.