To provide a mobile transaction method for processing a transaction without restriction of time and space.

The mobile transaction method is executed by using a portable type electronic device 1 for processing a transaction through an electronic transaction platform. The portable type electronic device 1 is connected to a payment card 13 for storing payment account information in a removable manner. In the method, the portable type electronic device 1 operates so as to generate transaction information associated with the transaction, acquire the payment account information from the payment card 13, and establish a session to communicate with the electronic transaction platform so as to cooperate with the electronic transaction platform for processing payment associated with the transaction.