A lap fillet arc welded joint comprising: a first steel sheet and a second steel sheet which are overlapped each other, the first steel sheet and the second steel sheet each having a tensile strength of 950 MPa or more; and a weld metal which extends along a corner formed by an upper surface of the first steel sheet and an end surface of the second steel sheet, wherein a Vickers hardness of the weld metal is 400 HV or less, and in a case where a cross section orthogonal to a weld line of the weld metal is viewed, when: a position of a fusion boundary present on the upper surface of the first steel sheet is defined as a point A; a position 0.5 mm away from the point A toward the weld metal in a X direction parallel to the upper surface of the first steel sheet is defined as a point D; a position 0.4 mm away from the point A toward the weld metal in the X direction is defined as a point C; an intersection point between a surface of the weld metal and a straight line which passes through the point D and extends in a thickness direction of the first steel sheet is defined as a point B; an angle between a straight line connecting the point A with the point B and a straight line connecting the point A with the point D is defined as a toe angle β of the weld metal; the total number of concave portions present on the surface of the weld metal included within a range between the point A and the point C is defined as NA; and the number of concave portions in contact with ferrite grains having a maximum grain size of 10 μm or more is defined as NB, the weld metal satisfies the following conditional expressions and at the same time. 0 ° < β < 30 ° NB/NA ≤ 0.70 wherein NA is ≥ 20. a first steel sheet and a second steel sheet which are overlapped each other, the first steel sheet and the second steel sheet each having a tensile strength of 950 MPa or more; and a weld metal which extends along a corner formed by an upper surface of the first steel sheet and an end surface of the second steel sheet, wherein a Vickers hardness of the weld metal is 400 HV or less, and in a case where a cross section orthogonal to a weld line of the weld metal is viewed, when: a position of a fusion boundary present on the upper surface of the first steel sheet is defined as a point A; a position 0.5 mm away from the point A toward the weld metal in a X direction parallel to the upper surface of the first steel sheet is defined as a point D; a position 0.4 mm away from the point A toward the weld metal in the X direction is defined as a point C; an intersection point between a surface of the weld metal and a straight line which passes through the point D and extends in a thickness direction of the first steel sheet is defined as a point B; an angle between a straight line connecting the point A with the point B and a straight line connecting the point A with the point D is defined as a toe angle β of the weld metal; the total number of concave portions present on the surface of the weld metal included within a range between the point A and the point C is defined as NA; and the number of concave portions in contact with ferrite grains having a maximum grain size of 10 μm or more is defined as NB, the weld metal satisfies the following conditional expressions and at the same time. 0 ° < β < 30 ° NB/NA ≤ 0.70 wherein NA is ≥ 20.