A blood test device (21) ensuring successful measurement wherein fingers scarcely slip out from the blood test device and blood never sticks to other sites in the course from the puncture of the patients skin to the completion of the blood test. This blood test device (21) comprises a cartridge (24) in which sensors (23) pooling blood oozing out from the punctured skin are stored in a layered state, a transport unit transporting a single sensor sheet (23) from the inside of the cartridge (24) to the outside, a holder (25) holding the transported sensor (23), a laser emitting unit (26) puncturing the skin in the state where the sensor (23) is held by the holder (25), and a pump (28) keeping the inside of the holder (25) and the inside of the cartridge (24) under negative pressure.
