Abstract: A ring-shaped biometric signal sensing device according to an embodiment of the present invention comprises: a first electrode (10), which is provided in a ring shape, is formed of conductors, and is fitted on a user's finger so as to make contract with the finger; a second electrode (20), which is assembled on the outside of the first electrode (10), is formed of conductors, and makes contact with the user's body; an insulation unit (30), which includes the first electrode (10) and is insert-injected so as to maintain insulation between the first electrode (10) and the second electrode (20); and a control unit (40), which is arranged in the insulation unit (30), includes a biometric sensor, and collects biometric signals when the second electrode (20) makes contact with the user's body.