The invention provides a facsimile apparatus which can perform the re-transmitting operation adapted to receive reception data in a good state on the reception side upon error re-transmission when a both-side document sheet is transmitted. At the time of a facsimile communication, the presence or absence of a both-side reception function is notified from a receiver to a transmitter and the both-side document sheet is designated by a DCS signal from the transmitter to the receiver. When the both-side document sheet is designated by the DCS signal, the front side and the reverse side are sequentially transmitted. When shifting to a one-side document sheet in the middle of the page, the one-side document sheet is designated by the DCS signal by returning to phase B. When the one-side document sheet is designated by the DCS signal and transmitted and the sheet is shifted to the both-side document sheet in the middle of the page, the both-side document sheet is designated by the DCS signal by returning to phase B and, thereafter, the front side and the reverse side are sequentially transmitted. As for the error re-transmission when an error occurs during the communication, the re-transmission from the front side is always performed upon transmission of the both-side document sheet.