To reliably record and preserve recorded data including the data necessary and sufficient for effective accident analyses, vehicle failure diagnostic data, and auxiliary data for vehicle repair as high-reliability data with a lightweight, small-sized, simple structure at a low cost while minimizing the number of wires required for connection.

The terminal part 20a of a drive recorder body 20 is inserted into a slot part 1h mounted on the board of an engine control device 1, and the slot part 1h is made integral with the drive recorder body 20. The drive recorder body 20 is stored in an aluminum case 20d and is fixed to the board of the engine control device 1 while being sealed by connecting legs 21a, 21a. The drive recorder body 20 stored in the aluminum case 20d is stored in the case 1i of the engine control device 1 together with the engine control device 1 and is fixed to a steering beam.