To provide a parking lot guide device capable of easily searching a parking position being a shadow while a driver considers the sunny state of a parking lot, and to provide a sunny state display method.

The parking lot guide device includes: a map information storing part 120 for storing map information including parking lot information indicating the shape and position of the parking lot being a display object and facility information indicating the shape and position of a building of the circumference of the parking lot; a sun position calculating part 140 for calculating the position of the sun at an arbitrary date and time as sun position information; a calculating part 280 for calculating a shadow area of the parking lot at an arbitrary date and time based on read map information and calculated sun position information; and an induction passage guide part 220 for displaying calculated shadow area. The shadow area information at the arbitrary date and time of the parking lot is provided to the driver. The driver can easily search the parking position being the shadow while considering the sunny state of the parking lot.