REFRIGERATION DEVICE FOR TRAILER

In an attachment portion (60) where a side edge portion (14a) of an opening (14) of a trailer (11) and a casing (31) are connected together, a vertically-extending groove (61) is formed in one of the trailer (11) or the casing (31) and a vertically-extending raised portion (62) is formed in the other one of the trailer (11) or the casing (31) so as to be fitted into the groove (61).