A transparent adhesive sheet comprising: a base material layer formed with a transparent material; an adhesive layer formed on a back surface side of the base material layer and formed with an adhesive agent for bonding to an adherend; a recording layer formed on a front surface side of the base material layer and including a color developing material that thermally develops color; a release layer formed on the further front surface side of the recording layer and having release properties to the adhesive agent, and an intermediate layer that is disposed on the front surface side of the recording layer to be in contact with the recording layer, wherein the intermediate layer includes a second diffuse reflection suppression component for suppressing diffuse reflection in the transparent adhesive sheet, the second diffuse reflection suppression component contains hydrophilic resins or water-soluble resins, the second diffuse reflection suppression component is core shell-type particles each containing the hydrophilic resins or the water-soluble resins in a shell, an average particle diameter of the color developing material is 0.1 to 1μm, wherein, the average particle diameter refers to a 50% average particle diameter or median diameter in a particle size distribution by volume standard measured using a Microtrac laser diffraction and scattering particle size analyzer, the transparent adhesive sheet is transparent in a state before the recording layer develops color, and the transparent adhesive sheet has opacity in accordance with JIS P8138 of not more than 25% in a state before the recording layer develops color. a base material layer formed with a transparent material; an adhesive layer formed on a back surface side of the base material layer and formed with an adhesive agent for bonding to an adherend; a recording layer formed on a front surface side of the base material layer and including a color developing material that thermally develops color; a release layer formed on the further front surface side of the recording layer and having release properties to the adhesive agent, and an intermediate layer that is disposed on the front surface side of the recording layer to be in contact with the recording layer, wherein the intermediate layer includes a second diffuse reflection suppression component for suppressing diffuse reflection in the transparent adhesive sheet, the second diffuse reflection suppression component contains hydrophilic resins or water-soluble resins, the second diffuse reflection suppression component is core shell-type particles each containing the hydrophilic resins or the water-soluble resins in a shell, an average particle diameter of the color developing material is 0.1 to 1μm, wherein, the average particle diameter refers to a 50% average particle diameter or median diameter in a particle size distribution by volume standard measured using a Microtrac laser diffraction and scattering particle size analyzer, the transparent adhesive sheet is transparent in a state before the recording layer develops color, and the transparent adhesive sheet has opacity in accordance with JIS P8138 of not more than 25% in a state before the recording layer develops color.