Measurement device unit

A measuring device unit, mountable to an exterior of a vehicle, comprising:

• a data processing device that includes a circuit board and a plurality of electronic components disposed on the circuit board, and that acquires detection data from a detector, to generate integrated data,
• a container that accommodates the data processing device, and
• a protective cover that covers the container;
• wherein
• the plurality of electronic components are classified in accordance with their respective heat generation amounts and respective heat resistance performances, and
• the plurality of electronic components include a first electronic component classified as having a heat generation amount that is greater than a heat generation reference value and a heat resistance performance that is greater than a heat resistance reference value,
• and wherein
• the container includes a plurality of accommodation spaces in which the plurality of electronic components are accommodated in accordance with their respective classifications,
• the plurality of accommodation spaces include a first accommodation space that is designed for suppressing heat transfer to other accommodation spaces,
• the first electronic component is accommodated in the first accommodation space,
• the protective cover is provided with:
• a front end portion that corresponds to a front end of the vehicle when the protective cover is mounted to the vehicle,
• a rear end portion that corresponds to a rear end of the vehicle when the protective cover is mounted to the vehicle,
• an introduction portion provided in the front end portion, communicating between a space and an exterior of the protective cover, with the space being defined by a separation between the protective cover and the container, and
• a discharge portion provided in the rear end portion, communicating between the space and the exterior of the protective cover,
• wherein the first accommodation space is an accommodation space closest to the rear end portion among the plurality of accommodation spaces and is downstream relative to the other accommodation spaces of the plurality of accommodation spaces along a pathway for cooling air extending in a direction from the introduction portion toward the discharge portion.