Abstract: The vehicular anti-theft device is a generally planar matt that includes a plurality of pressure sensors used to detect the presence of a weight thereon, and which is configured for placement under a tire of a vehicle. The matt includes a control panel to input a code to able and disable the alarm function. The alarm function is designed to detect a change in the weight associated with theft of a respective vehicle. The matt may include an array of solar cells on a top surface, which provides alternative means of powering the alarm function. The alarm includes a speaker to emit an audible alarm or alternatively cellular telephone capability in order to signal an alarm via a text message, phone message, or e-mail.