PURPOSE: To enable charging by respective multistage distances and/or respective types of mobile machines in mobile object communication relating to the charging device of the mobile object communication for which a time difference system by the multistage distances is introduced.

CONSTITUTION: This device is provided with a charging index setting means 11 for setting a message billing index MBI corresponding to the position registration area of the mobile machine to be the reference point of distance measurement at the time of the charging and also resetting the message billing index MBI when channel changeover extended over the position registration area is generated by the movement of the mobile machine and a tariff calculation processing means 12 for calculating a tariff for a call by the message billing index everytime the new message billing index is set by the message billing index setting means 11 and adding up the tariffs calculated for the respective message billing indexes when the call is completed to be defined as the call tariff of a caller.