To provide a second vehicle operation analysis device and a second vehicle operation analysis method capable of analyzing movement of a second vehicle and appropriately determining whether or not there is a possibility of clashing with the second vehicle.

Measurement means measures a lateral position coordinate value indicating a lateral position of a second vehicle relative to a self-vehicle and a lateral speed of the second vehicle relative to the self-vehicle. The lateral position coordinate value of the second vehicle is shown in a value of a sign corresponding to the position relative to the self-vehicle, and the lateral speed of the second vehicle is shown in a value of a sign corresponding to the movement direction relative to the self-vehicle. Interruption determination means determines whether or not the second vehicle is trying to cut in front of the self-vehicle on the basis of the sign of the lateral position coordinate value and the sign of the lateral speed.