Fan

The utility model relates to a fan. The fan comprises an outer cover. A shell and blades are arranged in the outer cover. A motor is arranged in the shell. An output shaft of the motor is provided with a positioning base. The fan is characterized in that the blades and the positioning base are integrally formed, the end face of the outer side of the output shaft of the motor is provided with an annular boss, a shoulder step is formed between the annular boss and the end face of the outer side of the output shaft of the motor, the positioning base is annularly arranged, sponge is pressed between the positioning base and the shoulder step, an inner ring face of the positioning base is provided with elastic tongue pieces, the elastic tongue pieces abut against the annular boss, and the positioning base and the shoulder step are fixed through bolts. By means of the technical scheme, the fan is convenient to mount and simple in structure, and the noise of the fan can be well lowered.