To provide an operation condition storage device for acquiring the operation status of a driver of two-wheeled vehicle.

This operation status storage device is provided with a camera 1 installed in a two-wheeled vehicle B; an acceleration detection means 2 for detecting the sequential acceleration Gx and lateral acceleration Gy of the two-wheeled vehicle B; and a storage means 34 for, under such conditions that the absolute value of the detected sequential acceleration Gx exceeds a sequential acceleration threshold ; or that the absolute value of the detected lateral acceleration Gy exceeds a lateral acceleration threshold , storing image data including image data photographed at a point of time when the conditions are satisfied by the camera 1, wherein the camera 1 is installed to photograph the rear part of the two-wheeled vehicle, and to photograph the driver h of the two-wheeled vehicle B and the operation conditions of the driver h.