Driving assistance device

A driving assistance device (1) that performs driving assistance based on a learning vehicle speed, including: a storage portion (20, 41) that stores vehicle speeds in relation to each location on a travel route for multiple times using a vehicle speed acquired when a driver performs accelerating and decelerating operations to make a vehicle travel, a first leaning portion (42) that learns a first learning vehicle speed at a location where the dispersion of a plurality of vehicle speeds is less than a threshold value when the location exists, a second learning portion (43) that learns a second learning vehicle speed at a location within a set range before the learned location, and a travel control portion (30, 31, 45) that performs travel control based on a current location of the travelling vehicle, the first learning vehicle speed and the second learning vehicle speed.