A vertical full rotation shuttle (1, 1a, 1b) comprising: an outer shuttle fixed to a lower shaft which is rotatable about an axis of rotation extending perpendicular to an axial line of a needle bar to which a sewing needle is attached, the outer shuttle including a hook portion having a distal end tapered toward a downstream side in a direction of rotation of the lower shaft; an inner shuttle retained by the outer shuttle so as to rotate about the axis of rotation, the inner shuttle including a peripheral wall part having a cylindrical shape and provided with a needle location hole in which the sewing needle can be inserted, and a flange part extending radially outward from one end of the peripheral wall part, an engaging recess being provided across the peripheral wall part and the flange part; a bobbin case removably mounted in the inner shuttle, the bobbin case having an engaging strip that removably engages with the engaging recess with a clearance in the direction of rotation; a spring member (50, 50a, 50b) supported in the engaging recess and disposed in the clearance in a state in which the engaging strip engages with the engaging recess; and a bobbin accommodated in the bobbin case for winding a lower thread thereon, characterized in that the engaging strip includes an engaging portion that fits into and engages with the engaging recess and a base portion that has a long plate shape and is connected to the engaging portion in a state in which the bobbin case is mounted in the inner shuttle, and is formed into a substantially L-shape, in that the flange part is provided with the spring member (50, 50a, 50b) that resiliently biases the engaging portion from an upstream side in the direction of rotation toward the downstream side in the direction of rotation by a spring force thereof in a state in which the engaging portion engages with the engaging recess, and in that the spring member (50, 50a, 50b) is a leaf spring which is fixed to the flange part on the upstream side of the direction of rotation with respect to the engaging recess. an outer shuttle fixed to a lower shaft which is rotatable about an axis of rotation extending perpendicular to an axial line of a needle bar to which a sewing needle is attached, the outer shuttle including a hook portion having a distal end tapered toward a downstream side in a direction of rotation of the lower shaft; an inner shuttle retained by the outer shuttle so as to rotate about the axis of rotation, the inner shuttle including a peripheral wall part having a cylindrical shape and provided with a needle location hole in which the sewing needle can be inserted, and a flange part extending radially outward from one end of the peripheral wall part, an engaging recess being provided across the peripheral wall part and the flange part; a bobbin case removably mounted in the inner shuttle, the bobbin case having an engaging strip that removably engages with the engaging recess with a clearance in the direction of rotation; a spring member (50, 50a, 50b) supported in the engaging recess and disposed in the clearance in a state in which the engaging strip engages with the engaging recess; and a bobbin accommodated in the bobbin case for winding a lower thread thereon, characterized in that the engaging strip includes an engaging portion that fits into and engages with the engaging recess and a base portion that has a long plate shape and is connected to the engaging portion in a state in which the bobbin case is mounted in the inner shuttle, and is formed into a substantially L-shape, in that the flange part is provided with the spring member (50, 50a, 50b) that resiliently biases the engaging portion from an upstream side in the direction of rotation toward the downstream side in the direction of rotation by a spring force thereof in a state in which the engaging portion engages with the engaging recess, and in that the spring member (50, 50a, 50b) is a leaf spring which is fixed to the flange part on the upstream side of the direction of rotation with respect to the engaging recess.