A sewing apparatus performs sewing operation on a work piece that moves along an X-Y plane perpendicular to an axial direction of a hollow needle having an inclined opening that is formed by angular cutting a portion of an end portion of the hollow needle that penetrates the work piece with respect to the axial direction of the hollow needle, by reciprocating the hollow needle in a penetrating direction, using a thread threaded in the hollow needle. In the sewing apparatus, Tatami stitches are formed on the work cloth with a plurality of stitches. First, a plurality of stitches are formed in a first stitching direction along a line angled between 20° and 160° with respect to a needle tip opening direction. Then, by controlling direction of movement of the work cloth so that the stitches in a second stitching direction proceed to an area opposite to the needle tip opening direction, a plurality of stitches are formed in a second stitching direction opposite to the first stitching direction, following and in parallel with the stitches formed in the first stitching direction.