Provided is a mobile communication method, in which in direct communication between a mobile station UE#1 and a mobile station UE#2, synchronization between the mobile station UE#1 and the mobile station UE#2 is appropriately established. A mobile communication method according to the present invention includes a step of transmitting, by the mobile station UE#2, “Timing information #1” indicating deviation of a reception timing of “Ud preamble #1” from a desired timing to a radio base station eNB on the basis of a received “Ud preamble #1”, and a step of transmitting, by the radio base station eNB, a “Ud TA command #1” for adjusting a transmission timing of a data signal in the third radio link to the mobile station UE#1 on the basis of received “Timing information #1”.