A ceramic heater in which a heater pattern is formed on a ceramic substrate is disclosed. The heater pattern has a heating element and lead portions. The heating element has heating connection ends and the lead portions have lead connection ends. The heating element and the lead portions are connected at joints which are formed by overlaying the heating connection ends and the lead connection ends. The heater pattern, as viewed in a direction perpendicular to a plane in which the heater pattern is formed, has inwardly recessed concavities formed on both widthwise sides of each of the joints. The concavities include portions in each of which a profile of the respective heating connection end crosses a profile of the respective lead connection end.