An ink jet printer for forming an ink jet printed long strip of cloth includes a design image generation unit, a receiving unit, a generating unit and a synthesizing unit. The design image generation unit generates design image data representing a design image repeatedly using a basic pattern. The receiving unit receives first designation data regarding a logotype mark, while the generating unit repeatedly generates logotype mark image data representing the logotype mark repeatedly using a logotype pattern independently from the repeated using of the basic pattern, in accordance with the first designation data received by the receiving unit. The synthesizing unit repeatedly synthesizes the design image data and the logotype mark image data in a fixed repetitive pattern and supplies the synthesized design and logotype mark image data to an ink jet head, so that an image including the design image and plural repetitive patterns of the logotype mark is printed onto the long strip of cloth along an elongated direction thereof by using the ink jet head.