To provide an emergency reporting method and device with which a center operator can easily grasp an accident situation and the number of passengers by detecting the number of passengers with a seat sensor or a seatbelt fastening sensor provided to an on-vehicle machine which detects weight applied to seat and transmitting the number of the passengers in addition to position information and accident situation information with radio equipment.

This emergency reporting device 5 mounted on a vehicle is provided with a GPS receiving part 8 which is connected to a GPS antenna 9 and receives data from a GPS satellite, a gyroscope 10, a vehicle speed pulse detecting part (speed sensor) 11, a collision detecting part (collision sensor) 12, a seat weight detecting part (seat sensor) 13 detecting seat weight applied to a sheet, a seatbelt fastening detecting part (seatbelt fastening sensor) 14 detecting that a seatbelt is fastened and a public portable telephone (radio equipment) 6 and is further provided with a controlling part 7 controlling them.