Semiconductor ceramic and positive characteristic thermistor

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A semiconductor ceramic of the present invention includes a Ba m TiO 3 -based composition, as a main component, having a perovskite structure represented by general formula A m BO 3 . The molar ratio m between an A site and a B site satisfies 1.001 ‰¤ m ‰¤ 1.01. Part of Ba constituting the A site is replaced with Bi, Ca, a rare-earth element, and at least one of Li and Na. The content of the Ca when the total number of moles of the elements constituting the A site is 1 mole is 0.05 to 0.20 (preferably 0.125 to 0.175) on a molar ratio basis. A PTC thermistor includes a component body 1 formed of the semiconductor ceramic. Accordingly, there is provided a lead-free semiconductor ceramic that substantially does not contain lead and that has desired PTC characteristics and high reliability