HEATING FURNACE

To provide a heating furnace in which a ceramic heater can be easily replaced.SOLUTION: A heating furnace 1 has: a furnace body 10 including a lateral wall 11 and a lid 13; a ceramic heater 20; and a holding pin 30 for holding the ceramic heater 20 on the lateral wall 11. The ceramic heater 20 has: a heater body part 21 held by the holding pin 30; a first terminal part 22 which is disposed in a first through-groove 11a provided at the upper end of the lateral wall 11 so as to be led out to the outside of the lateral wall 11; and a second terminal part 23 which is disposed in a second through-groove 11b provided at the upper end of the lateral wall 11 so as to be led out to the outside of the lateral wall 11. The holding pin 30 has: a linear part 31 which is inserted through a fitting hole 11c provided on the lateral wall 11; and a holding part 32 which is integrally continuous with one end of the linear part 31 and protrudes upward with respect to the linear part 31, and whose minimum gap C with an inner peripheral surface of the lateral wall 11 is equal to or larger than a wire diameter of the heater body part 21.SELECTED DRAWING: Figure 4 【課題】セラミックヒーターを容易に交換することが可能な加熱炉を提供することである。【解決手段】側壁１１と蓋体１３とを備えた炉本体１０と、セラミックヒーター２０と、セラミックヒーター２０を側壁１１に保持する保持ピン３０とを有し、セラミックヒーター２０が、保持ピン３０に保持されたヒーター本体部２１と、側壁１１の上端に設けられた第１貫通溝１１ａに配置されて側壁１１の外側に引き出された第１端子部２２と、側壁１１の上端に設けられた第２貫通溝１１ｂに配置されて側壁１１の外側に引き出された第２端子部２３と、を有し、保持ピン３０が、側壁１１に設けられた取付用孔１１ｃに挿通された直線部３１と、直線部３１の一端に一体に連なるとともに直線部３１に対して上方に突出し、側壁１１の内周面との間の最小隙間Ｃがヒーター本体部２１の線径以上である保持部３２と、を有することを特徴とする加熱炉１。【選択図】図４