Abstract: The present disclosure relates to a heater and a hair drying apparatus. The heater includes an inner layer including a first end wall, a second end wall, a third end wall and a fourth end wall; the first end wall is arranged opposite to the second end wall; the third end wall is arranged opposite to the fourth end wall; the third end wall and the fourth end wall are respectively connected between the first end wall and the second end wall; and a heating element arranged on the third end wall. Compared with mica material, plastic material possesses better plastic performance with greater hardness. By manufacturing the inner layer of the heater using the plastic material, the inner layer is easier to be set to alternative shapes and fixed to. Therefore, other structural elements are easier to be mounted relative to the inner layer.