A laser lap-welded joint comprising: two steel sheets; and a plurality of welded portions that are formed by welding and joining together the two steel sheets which are in a state of being stacked one on top of the other, wherein each of the plurality of welded portions has a substantially C-shaped surface being arranged in an array, wherein each of the welded portions is formed of a first linear portion extending in an array direction and second linear portions which are formed at ends of the first linear portion and each of the second linear portions has a surface having a semicircular shape, wherein a radius R (mm) of the semicircular shape and a sheet thickness (mm) t being the sheet thickness of one of the steel sheets having a sheet thickness larger than a sheet thickness of the other of the steel sheets or the sheet thickness of any of the two steel sheets, when the two steel sheets have an identical sheet thickness, satisfy a formula, wherein a gap G (mm) between the two steel sheets and the sheet thickness t satisfy a formula, wherein a ratio l/λ of a weld length 1 (mm) to a pitch λ (mm) between the welded portions that are adjacent to each other satisfies a formula and the weld length 1 (mm) is a sum of a length of the first linear portion and lengths of the second linear portions in each of the welded portions, wherein the sheet thickness t satisfies a formula, wherein a space X (mm) between an end of a contact portion where the two steel sheets are in contact with each other and each of the welded portions satisfies a formula, wherein a ratio W/t of a width W (mm) of each of the welded portions to the sheet thickness t satisfies a formula, and wherein at least one of the two steel sheets has a composition containing, in % by mass, C: higher than 0.07% and 0.25% or lower, P+S: lower than 0.03%, Mn: 1.8% or higher and 3.0% or lower, and Si: higher than 1.2% and 1.8% or lower and having the balance being Fe and unavoidable impurities, the at least one of the two steel sheets having a tensile strength TS of 980 MPa or greater. 0 < R ≤ 1.5 t G ≤ 0.25 t 0.4 ≤ 1 / λ < 0.7 t ≤ 4.0 mm 2 t ≤ X ≤ 4 t 0.3 ≤ W / t ≤ 1.0 two steel sheets; and a plurality of welded portions that are formed by welding and joining together the two steel sheets which are in a state of being stacked one on top of the other, wherein each of the plurality of welded portions has a substantially C-shaped surface being arranged in an array, wherein each of the welded portions is formed of a first linear portion extending in an array direction and second linear portions which are formed at ends of the first linear portion and each of the second linear portions has a surface having a semicircular shape, wherein a radius R (mm) of the semicircular shape and a sheet thickness (mm) t being the sheet thickness of one of the steel sheets having a sheet thickness larger than a sheet thickness of the other of the steel sheets or the sheet thickness of any of the two steel sheets, when the two steel sheets have an identical sheet thickness, satisfy a formula, wherein a gap G (mm) between the two steel sheets and the sheet thickness t satisfy a formula, wherein a ratio l/λ of a weld length 1 (mm) to a pitch λ (mm) between the welded portions that are adjacent to each other satisfies a formula and the weld length 1 (mm) is a sum of a length of the first linear portion and lengths of the second linear portions in each of the welded portions, wherein the sheet thickness t satisfies a formula, wherein a space X (mm) between an end of a contact portion where the two steel sheets are in contact with each other and each of the welded portions satisfies a formula, wherein a ratio W/t of a width W (mm) of each of the welded portions to the sheet thickness t satisfies a formula, and wherein at least one of the two steel sheets has a composition containing, in % by mass, C: higher than 0.07% and 0.25% or lower, P+S: lower than 0.03%, Mn: 1.8% or higher and 3.0% or lower, and Si: higher than 1.2% and 1.8% or lower and having the balance being Fe and unavoidable impurities, the at least one of the two steel sheets having a tensile strength TS of 980 MPa or greater. 0 < R ≤ 1.5 t G ≤ 0.25 t 0.4 ≤ 1 / λ < 0.7 t ≤ 4.0 mm 2 t ≤ X ≤ 4 t 0.3 ≤ W / t ≤ 1.0 C: higher than 0.07% and 0.25% or lower, P+S: lower than 0.03%, Mn: 1.8% or higher and 3.0% or lower, and Si: higher than 1.2% and 1.8% or lower and having the balance being Fe and unavoidable impurities, the at least one of the two steel sheets having a tensile strength TS of 980 MPa or greater. 0 < R ≤ 1.5 t G ≤ 0.25 t 0.4 ≤ 1 / λ < 0.7 t ≤ 4.0 mm 2 t ≤ X ≤ 4 t 0.3 ≤ W / t ≤ 1.0