Blower and indoor unit

A blower, comprising:

• a cross flow fan;
• a motor configured to rotate the cross flow fan about a rotation axis;
• a front tongue part that is arranged in front of the cross flow fan;
• and
• a back tongue part that is arranged in back of the cross flow fan, wherein
• a front fan facing surface of the front tongue part, the front fan facing surface facing the cross flow fan, includes:
• a plurality of front non-flat portions on which non-flatness is formed;
• and
• a plurality of front flat portions on which no non-flatness formed,
• a back fan facing surface of the back tongue part, the back fan facing surface facing the cross flow fan, includes:
• a plurality of back non-flat portions on which non-flatness formed;
• and
• a plurality of back flat portions on which no non-flatness formed,
• the plurality of back non-flat portions respectively face the plurality of front flat portions, with the cross flow fan interposed between the plurality of back non-flat portions and the plurality of front flat portions,
• the plurality of back flat portions respectively face the plurality of front non-flat portions, with the cross flow fan interposed between the plurality of back flat portions and the plurality of front non-flat portions,
• the front fan facing surface has a step that is formed along a straight line parallel to the rotation axis, and
• the step has a plurality of non-flat parts that are arranged parallel to the rotation axis.