A wearable sensor device (1) comprises a sensor (5) at least part of which is inserted into a human body and which has a first connection terminal (7); a mount unit (6) on which at least part of the first connection terminal (7) of the sensor (5) is disposed and which is mounted on a skin of the human body; and an electronic unit (3) that is mounted to the mount unit (6) and has a second connection terminal (10) connected to the first connection terminal (7) of the sensor (5) via the mounting mechanism (8), and a control unit for acquiring signals from the sensor (5). The mounting mechanism (8) forms a first state where the mount unit (6) and the electronic unit (3) are mounted in a state in which the first connection terminal (7) and the second connection terminal (10) have yet to be connected, and a second state where the mount unit (6) and the electronic unit (3) are mounted in a state in which the first connection terminal and the second connection terminal have been connected.
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