To provide an ultrasmall chip-shaped electronic component and a ceramic core used therein, which secures the necessary bonding strength of electrode terminals when mounted on a circuit board.

A ceramic core comprises a core part and a leg for holding the core part by both edges thereof, measuring 1.1 mm or less in the lengthwise direction and 0.6 mm or less in the breadthwise direction in a plan view. The edge of a protruding part of the leg in the breadthwise direction of the ceramic core has its corners and ridgelines curved at a radius of curvature of 5-25 μm.