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In an IC card reader/writer of the present invention including a control section for controlling a power supply to a detachable IC card, a supply of an operation clock, a reset thereof, and an I/O branch section for receiving/transmitting serial data from/to the IC card, wherein a signal is received/transmitted between a personal computer and the control section and data is received/transmitted between the personal computer and the I/O branch section, the IC card reader/writer comprises a serial-parallel converter for mutually converting serial data receiving/transmitting from/to the IC card and parallel data receiving/transmitting from/to the personal computer, an access control section connected to the personal computer by an address bus and a control signal line, an IC card data port and a status port both connected to the personal computer by a data bus and connected to the serial-parallel converter, and a reader/writer control port connected to the personal computer by the data bus and connected to the control section. The access control section controls each of the ports, by an address and a read signal or a write signal supplied from the personal computer. Thus, in the IC card reader/writer for receiving and transmitting data between the personal computer and the IC card, processing speed is improved and control complexity is simplified.