The utility model provides a heat exchanger and air conditioner, include: casing including first end and the relative second end that sets up with first end, first region and second area are drawn together to the second hand ladle, first end is located to the fan, and the fan is by first end to the air supply of second end, the second end is located to the heat exchanger part, the heat exchanger part includes: first heat transfer bank of tubes group locates first region, includes a plurality of first heat transfer banks of tubes and connects in a plurality of first fin of the exclusive wall offirst heat exchange tube, second heat transfer bank of tubes group locates the second area, includes a plurality of second heat transfer banks of tubes and connects in a plurality of second fins of the exclusive wall of second heat exchange tube, wherein, the wind speed in first region is greater than the wind speed of second area, and the windage of first heat transfer bank of tubes group is greater than the windage of second heat transfer bank of tubes group. Through the utility model discloses technical scheme has dwindled the heating load difference between the heat transfer bank of tubesgroup, and the heat transfer ability that makes the first heat transfer bank of tubes group and the second heat transfer bank of tubes organize obtains balancedly, has improved heat exchange efficiency.