A tip (12a) has a contact section (22) coming in contact with skin around a piercing site (P). A blood component measurement device (10a) has a skin temperature sensor (132) for measuring skin temperature (T) of a portion near the piercing site (P), a skin temperature determination section (150b) for comparing and determining the measured skin temperature (T) and a threshold value (Th1), and a liquid crystal monitor (152) and a speaker (162) for providing the result of the determination. The skin temperature sensor (132) is a contact type and is provided at a portion that comes in contact with skin.
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