The invention relates to a housing for protecting an electronic device (1) to be fitted to a motor vehicle, the housing comprising a plurality of shells (2, 3) forming a front (2) and a cap (3), these being assembled together to define jointly an enclosure (4) for housing an electronic card (1) provided with remote connectors (13), wherein at least one first shell (3) is formed from at least two elementary shells (18) and said first shell (3) includes, molded into it, at least one mobility means allowing relative movement between the elementary shells. The first shell (3) is formed in one piece, the two elementary shells (18) are situated side by side, each comprising a window for the passage and/or reception of a connector (13), and said mobility means comprises an elastically deformable member (26).