To provide a sewing machine under-cover capable of improving workability of an operator by reducing a vertical direction dimension of a circuit board arranged under a sewing machine table.

An under-cover 200 comprises a first cover part 210 and a second cover part 220, in which a lower surface of the under-cover 200 is located higher in the second cover part 220 than in the first cover part 210 when the under-cover 200 is attached to a sewing machine table 20. A bearing 52 of a switch lever 50 is arranged inside the second cover part 220, thereby allowing a maintenance operator to work in a space greater than a space below the first cover part 210.