A semiconductor package is provided in which a first adhesive film includes a first extension portion extending relative to a side surface of a first semiconductor chip in a second direction, perpendicular to the first direction, the first extension portion has an upper surface including a first recess concave toward a base chip, each of the plurality of second adhesive films includes a second extension portion extending relative to side surfaces of the plurality of second semiconductor chips in the second direction, and the second extension portion has an upper surface including a second recess concave in the first direction and a lower surface including a protrusion in the first recess or the second recess.