A screw cap container comprising a container main body and a screw cap (B, C, D, E), wherein the container main body includes a mouth tubular portion, which is provided on an outer circumference thereof with slope screw portions (2, 25) configured to be screwed to the screw cap (B, C, D, E), the slope screw portions (2, 25) are configured by upper screw protrusions (4a, 4b, 4c, 4d) disposed at three or more different positions at an equal interval in a top view thereof; lower long screw protrusions (5a, 5b, 5c, 5d) having left end positions same as left end positions of the upper screw protrusions (4a, 4b, 4c, 4d), being disposed a predetermined height below and in parallel with the upper screw protrusions (4a, 4b, 4c, 4d), and each having a length longer than a length of each upper screw protrusion (4a, 4b, 4c, 4d); and oblique screw protrusions (6a, 6b, 6c, 6d) extending obliquely in an upper right direction from right ends of the lower long screw protrusions (5a, 5b, 5c, 5d) and each being connected to a left end of a different one of the upper screw protrusions (4a, 4b, 4c, 4d), the screw cap (B, C, D, E) includes a top wall and an outer circumferential wall (12, 20) suspended from an outer edge of the top wall, and the outer circumferential wall (12, 20) is provided on an inner circumference thereof with cap screw protrusions (15a, 15b, 15c, 15d) disposed at an equal interval and at an equal height in the same number as the number of the upper screw protrusions (4a, 4b, 4c, 4d) and thus configured to be screwed with the slope screw portions (2, 25) of the container main body, characterized in that the slope screw portions (2, 25) protrude as three or more ridges being not interconnected. the container main body includes a mouth tubular portion, which is provided on an outer circumference thereof with slope screw portions (2, 25) configured to be screwed to the screw cap (B, C, D, E), the slope screw portions (2, 25) are configured by upper screw protrusions (4a, 4b, 4c, 4d) disposed at three or more different positions at an equal interval in a top view thereof; lower long screw protrusions (5a, 5b, 5c, 5d) having left end positions same as left end positions of the upper screw protrusions (4a, 4b, 4c, 4d), being disposed a predetermined height below and in parallel with the upper screw protrusions (4a, 4b, 4c, 4d), and each having a length longer than a length of each upper screw protrusion (4a, 4b, 4c, 4d); and oblique screw protrusions (6a, 6b, 6c, 6d) extending obliquely in an upper right direction from right ends of the lower long screw protrusions (5a, 5b, 5c, 5d) and each being connected to a left end of a different one of the upper screw protrusions (4a, 4b, 4c, 4d), the screw cap (B, C, D, E) includes a top wall and an outer circumferential wall (12, 20) suspended from an outer edge of the top wall, and the outer circumferential wall (12, 20) is provided on an inner circumference thereof with cap screw protrusions (15a, 15b, 15c, 15d) disposed at an equal interval and at an equal height in the same number as the number of the upper screw protrusions (4a, 4b, 4c, 4d) and thus configured to be screwed with the slope screw portions (2, 25) of the container main body, characterized in that the slope screw portions (2, 25) protrude as three or more ridges being not interconnected.