Abstract: A mobile mortuary in which a semi-trailer has extendable large side walls. The inside of the semi-trailer which constitutes a mobile unit is divided into three compartments, one a cooled end cabin, independent of the other two, with a side access door, for emplacement of the casket, which is visible through an inside end window, and the other two compartments define the zone in which the body has extendable facing side walls. One of these compartments, which is at the end, can be accessed via the rear end of the unit by a staircase and a ramp, both of which can be folded up into the structure or chassis. Motors are installed in the semi-trailer chassis structure to drive a rack and pinion mechanism. Each rack is mounted on the moving part of the side wall, and the side walls are guided in their displacement by upper and lower guides with rollers which move along facing guides in the stationary portion of the body.