Bottom shell of vehicle-mounted unit

The utility model discloses a vehicle-mounted unit bottom shell, which relates to the technical field of ETC (electronic toll collection), and comprises a bottom shell body, a hole is arranged at the side part of the bottom shell body, a cantilever key is arranged at the hole, the cantilever key comprises a cantilever part and a key part, one end of the cantilever part is integrally connected with the bottom shell body, and the key part is integrally connected to the other end of the cantilever part. The position of the key part corresponds to that of the Bluetooth electronic switch of the PCB, and in a natural state, a gap is formed between the key part and the Bluetooth electronic switch. Key molds do not need to be added, the mold development cost is reduced, the injection molding production pressure is reduced, and the warehouse material management and control cost is reduced; meanwhile, the process of assembling the keys in the production and assembly process is reduced, the labor can be reduced, and the