Self Position Estimation Method and Self Position Estimation Device

A self position estimation method is provided which is capable of accurately estimating, when executing automatic parking to a parking target position using a stored surrounding situation, a position of a host vehicle or a target in the surrounding situation stored in a storage device. The method includes a step that presents the stored surrounding situation, a step that receives an operation of setting a positional relationship between the stored surrounding situation, and at least one of the host vehicle and the targets existing around the host vehicle, and a step that sets a position of at least one of the host vehicle and the target in the stored surrounding situation based on the operation.