A bridge circuit of an embodiment includes: a command transfer portion which is configured by wired logic into which a host controller capable of sending a command that corresponds to each of a plurality of devices inputs the command, and which is configured to transfer the inputted command to the plurality of devices; a command analysis portion which is configured by wired logic, and which is configured to analyze the command from the host controller; and a response reply portion which is configured by wired logic, and which is capable of reading out a response based on an analysis result of the command analysis portion from a register that holds a response corresponding to the command and sending the response to the host controller.