Provided is a ceramic package arranged so that when filling a liquid electrolyte into a concave portion, the corrosion of a metal conductor portion owing to the electrolyte hardly spreads to an outside of the concave portion. A ceramic package (1a) for filling a liquid component-containing electrolyte comprises: a package main body (2) arranged by laminating a plurality of ceramic layers (c1, c2) and having surfaces (3, 4) opposed to each other; a concave portion (5) formed in the surface (3) of the package main body (2) and having a bottom surface (6) and a side surface (7); a plurality of electrode pads (8) formed on an inside layer surface (13) between ceramic layers (c1, c2) extending in a surface direction from the bottom surface (6) of the concave portion (5); and a plurality of external connection terminals (14) formed on the opposite surface (4) of the package main body (2). Each electrode pad (8) has a pad main body (8x) having a polygon form in plan view and an inside portion (9) formed along the inside layer surface (13) between the ceramic layers (c1, c2). The inside portion (9) has a convex portion (10) which protrudes from the pad main body (8x) toward an outside in plane view. Between the convex portion (10) and the external connection terminal (14), a via conductor (11) passing through the ceramic layer (c1) is formed.