A sewing machine includes: a needle rod being reciprocated vertically; tension discs sandwiching an upper thread; a feed mechanism transporting a sewing object in a vertical direction; a reciprocating mechanism reciprocating the needle rod laterally; an upper thread tension adjusting mechanism adjusting the tension discs; a feed amount adjusting mechanism adjusting a feed amount of the feed mechanism; a stitch width adjusting mechanism adjusting a stitch width of the reciprocating mechanism; and a control apparatus controlling the upper thread tension adjusting mechanism, the feed amount adjusting mechanism, and/or the stitch width adjusting mechanism. A common adjusting mechanism, being one of the feed amount adjusting mechanism and the stitch width adjusting mechanism, includes: a motor; an adjusting mechanism body being a tooth-missing gear and/or a cam; and a variation amount adjusting unit. The upper thread tension adjusting mechanism includes: a thread loosening portion; and an upper thread tension adjusting unit.