PURPOSE: To obtain an ink jet recorder in which problems such as color mixing of recording ink drops, trimming of recording dots, and the like are settled, by arranging means which contacts with a recording sheet and applying ultrasonic vibration thereon in the carrying part of the recording sheet.

CONSTITUTION: A ultrasonic wave generating means 10 is arranged, in contact with a recording sheet 4, in the downstream side from recording heads 1a, 1b in the carrying direction of recording sheet 4 on the opposite side of the recording heads 1a, 1b with respect to the recording sheet 4. Approximately at the same time or after recording onto the recording sheet 4 through the recording heads 1a, 1b, the ultrasonic wave generating means 10 applies ultrasonic vibration onto the recording sheet 4 from the non-recording face (rear) side thus delivering recording ink drops though the recording heads 1a, 1b onto the recording sheet 4 and dispersing the ink drops uniformly within the recording sheet 4. It is particularly effective in the point that the image quality is improved when plural colors of recording ink are employed.