A notification device includes an identification information acquisition section that acquires identification information output from an in-vehicle device in response to a change of a vehicle condition, a sound source data acquisition section capable of performing an acquisition operation of acquiring sound source data from an outside, a storage section capable of storing the sound source data for notification acquired by the sound source acquisition section and association data in which the identification information and the sound source data for notification are associated with each other, and a control section that outputs the sound source data for notification on the basis of the association data when the identification information acquisition section acquires the identification information. The sound source data acquisition section and the storage section are provided in a mobile terminal, and the mobile terminal is provided with an association data edit section capable of editing the association data.