The present invention relates to a vehicular instrument mounting structure in which an auxiliary battery is mounted so as to be as high as a power control device , for protecting the power control device by a protector even when the auxiliary battery interferes with the power control device. The power control device is fastened to the upper surface of a transaxle by a screw via a mounting foot provided in the front-rear direction of the vehicle. The protector for protecting a corner of the power control device is fastened to the power control device and the transaxle by screws for a power control device fastening part and a transaxle fastening part. The power control device has a power cable for supplying power and a discharger for rapid discharge at a time of emergency.