Provided is a portable thermal printing device including: a support plate assembly; a heat insulation plate disposed on the support plate assembly; and a heating plate disposed on the heat insulation plate and including a uniform heating plate body, a covering layer, and a heating element disposed between the uniform heating plate body and the covering layer; and an electrical connection element detachably connected to the heating element via magnetic attraction and configured to connect to an external power source and supply power to the heating element. With such a simple structure, portable thermal printing operations can be achieved.

A thermal print head includes: a substrate including a main surface; an insulating film arranged on the main surface; a first wiring layer arranged on the insulating film; a first interlayer insulating film arranged on the first wiring layer; a heat-generating body film; and a second wiring layer arranged on the first interlayer insulating film with the heat-generating body film interposed therebetween, wherein a bump is formed on the main surface, wherein the bump extends along a first direction in a plan view, wherein the second wiring layer extends along a second direction orthogonal to the first direction to intersect the bump in a plan view, and includes first, second, third, and fourth wirings arranged along the first direction, wherein the second wiring is located between the first wiring and the third wiring, and wherein the third wiring is located between the second wiring and the fourth wiring.

A thermal print head includes a substrate and a glaze layer. The substrate has a main surface. The glaze layer is disposed on the main surface. The glaze layer includes a hollow filler.