PURPOSE: To execute easily replacement of a recording medium and jam processing, by assembling a recording medium part and a part of a peripheral apparatus into a unit to load to or unload from the body.

CONSTITUTION: A belt cassette 1 is constituted so as to be freely attachable and detachable to and from the body. On this belt cassette 1, an endless belt-like recording medium 2 is provided. Also, each device such as a destaticizing charger 3, a electrifying charger 4, a recording head 5 and a cleaner 8, which have been placed on the upper side of the belt cassette 1 is fitted on a common base to convert to a unit. This part which has been converted to a unit, and the belt cassette 1 are formed as an upper unit A to be attached and detached freely to and from the body.