A rack mount device comprising: a housing; first and second drawer sections to be withdrawable from the housing; storage sections provided in the first and second drawer sections, each of storage sections including memory devices; a control module to control the memory devices; a connection cable to couple an external connection terminal of the housing and the control module and include an excess length portion corresponding to movement of the control module; a cable protective tube to be inserted by the excess length portion, one end of the cable protective tube fixed in a vicinity of a connection portion to the control module of the connection cable, another end of the cable protective tube fixed on a bottom plate side of the housing, the cable protective tube including a folded-up section which moves along with the drawing operation; and a cable protective tube deformation device to move the folded-up section.