Angular velocity correcting devices, angular velocity correcting methods, and navigation devices are disclosed. In some implementations, a first sensor sensitivity correcting method for considering variation of sensor sensitivity due to an oblique angle of an angular velocity detecting sensor with respect to a horizontal plane and a sensitivity error of the angular velocity detecting sensor and correcting the sensor sensitivity is enabled. A second sensor sensitivity correcting method for considering the variation of the sensor sensitivity due to the oblique angle of the angular velocity detecting sensor with respect to the horizontal plane without considering the sensitivity error and correcting the sensor sensitivity is enabled. The sensitivity error is calculated on the basis of a ratio of the sensor sensitivity obtained by the first sensor sensitivity correcting method to the sensor sensitivity obtained by the second sensor sensitivity correcting method. The angular velocity from the angular velocity detecting sensor using the sensitivity error is corrected.