To selectively obtain control information effective to failure diagnosis of a vehicle.
The vehicle information accumulating device is connected to an electronic control device for controlling a vehicle. The vehicle information accumulating device includes an accumulated data thinning setting table storing thinning conditions of control data indicating at least either of a control command to a vehicle or a control state, the first communication interface receiving the control data from the electronic control device, a thinning processing part thinning the control data received through the first communication interface in accordance with the thinning conditions, and a data return part sending the control data thinned by the thinning processing part to the electronic control device through the first communication interface.
SHIMURA AKITOSHI
TANIGAWA KEIKO
