NOVELTY - Assembly of rotary machine includes inserting a rotor into a first casing (32) so that a first support shaft (55) may be supported by a first support part (35), assembling the first casing so that a second support shaft (56) of the rotor may be supported by a second support part (36) while obstructing a first opening part (34a) for a second casing (33) by which the second support part is provided in one of the axial center directions, and a second opening part is formed in the other axial center direction by the second opening part, and assembling a second bearing.    USE - Assembly of rotary machine (claimed) in frames, such as a boat and a ship.    ADVANTAGE - Highly accurate assembly operation of rotary machine is achieved; and efficiency improvement of the assembly operation is enabled. It becomes possible to combine the shaft center of each structural component easily. The assembly operation is performed easily for a short time. The method reduces the shake of a wave when the rotary machine is assembled e.g. in a boat and ship.    DETAILED DESCRIPTION - Assembly of rotary machine comprises positioning a first casing (32) by which a first support part (35) is provided in one of an axial center directions, and first opening part (34a) formed in the other axial center direction so that the first support part may become the downward direction while an axial center direction turns into a perpendicular direction, inserting a rotor into a first casing so that a first support shaft (55) may be supported by the first support part, assembling the first casing so that a second support shaft (56) of the rotor may be supported by a second support part (36) while obstructing the first opening part for a second casing (33) by which the second support part is provided in one of the axial center directions, and the second opening part is formed in the other axial center direction by the second opening part, assembling a second bearing between the second support part and second support shaft, reversing the first casing and second casing and making an up-and-down position reverse, and assembling the first bearing between the first support part and first support shaft. INDEPENDENT CLAIMS are included for:    (A) wave activated generator; and    (B) rotary machine.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view showing the assembly operation of second casing.    First casing (32)    Second casing (33)    First opening part (34a)    First support part (35)    Second support part (36)    First support shaft (55)    Second support shaft (56)