A body fluid collection device, comprising: a housing including a skin surface sheet capable of adhering tightly to a skin and an upper surface cover having elasticity, the upper surface cover being formed of a material capable of transmitting visible light; an inner support configured to support a hollow needle and arranged in the upper surface cover on an inside of the housing, wherein the upper surface cover includes, on an inner surface of the housing, an upper spacer configured to project in a direction of the skin surface sheet and the inner support includes a lower spacer configured to project in an opposite direction to the skin surface sheet; and wherein the hollow needle is configured to interlock with the upper surface cover and accommodated in the housing, wherein at least part of a space in the housing communicates with an interior of the hollow needle, and wherein the body fluid collection device is configured such that: through deformation of the upper surface cover by application of an external force in a direction of the skin surface sheet to the upper surface cover with the skin surface sheet adhering tightly to the skin, the hollow needle penetrates the skin surface sheet to perforate the skin, and a body fluid flows in the space communicating with the interior of the hollow needle through the hollow needle; and through recovery of the upper surface cover to an original shape by elimination of the external force, the hollow needle again becomes accommodated in the housing. a housing including a skin surface sheet capable of adhering tightly to a skin and an upper surface cover having elasticity, the upper surface cover being formed of a material capable of transmitting visible light; an inner support configured to support a hollow needle and arranged in the upper surface cover on an inside of the housing, wherein the upper surface cover includes, on an inner surface of the housing, an upper spacer configured to project in a direction of the skin surface sheet and the inner support includes a lower spacer configured to project in an opposite direction to the skin surface sheet; and wherein the hollow needle is configured to interlock with the upper surface cover and accommodated in the housing, wherein at least part of a space in the housing communicates with an interior of the hollow needle, and wherein the body fluid collection device is configured such that: through deformation of the upper surface cover by application of an external force in a direction of the skin surface sheet to the upper surface cover with the skin surface sheet adhering tightly to the skin, the hollow needle penetrates the skin surface sheet to perforate the skin, and a body fluid flows in the space communicating with the interior of the hollow needle through the hollow needle; and through recovery of the upper surface cover to an original shape by elimination of the external force, the hollow needle again becomes accommodated in the housing. through deformation of the upper surface cover by application of an external force in a direction of the skin surface sheet to the upper surface cover with the skin surface sheet adhering tightly to the skin, the hollow needle penetrates the skin surface sheet to perforate the skin, and a body fluid flows in the space communicating with the interior of the hollow needle through the hollow needle; and through recovery of the upper surface cover to an original shape by elimination of the external force, the hollow needle again becomes accommodated in the housing.