COMMUNICATION SYSTEM FOR WORKING MACHINE

To provide a communication system for a working machine (1) capable of easily updating setting information of a working device (2) connected to the machine body (3).A communication system for a working machine (1) includes: a machine body (3); a working device (2) provided on the machine body (3) to perform work; a communicator device (46) to receive setting information relating to setting of the machine body (3) or the working device (2); and a controller device (40), the communication system being configured to transmit the setting information from a server (47b) to the working machine (1). The server (47b) determines a transmitting operation to the working machine (1) based on a response result of the communicator device (46) when the server (47b) communicates with the communicator device (46) to transmit the setting information, and the communicator device (46) determines an accepting operation for the setting information depending on a status of the working machine (1).