An analyzer (1) is provided, which includes a casing (10), a first shaft member (75) supported by the casing (10) to be rotatable, and formed with a first through-hole (75a), a second shaft member (85) inserted into the first through-hole (75a) and supported by the casing (10) via the first shaft member (75) to be rotatable with respect to the casing (10) and the first shaft member (75), a first rotational support (31A, 33A) capable of supporting a container (32, 34) and coupled to the first shaft member (75) to be integrally rotatable with the first shaft member (75), a second rotational support (31B, 33B) capable of supporting another container (32, 34) and coupled to the second shaft member (85) to be integrally rotatable with the second shaft member (85), and first and second drive mechanisms (65, 66) configured to rotate the first and second shaft members (75, 85), respectively.