A heating cooking device comprising: a heating chamber having a front face opening on a front face of the heating chamber , an upper wall disposed on an upper part of the heating chamber , a left-side wall disposed on a left-side part of the heating chamber , a right-side wall disposed on a right-side part of the heating chamber , a back wall disposed on a rear part of the heating chamber and a bottom wall disposed on a lower part of the heating chamber ; a heater configured to heat an object to be heated stored in the heating chamber ; a camera that has an optical axis and is disposed on the upper wall of the heating chamber to face inside of the heating chamber ; and a first illuminator arranged on an upper side of the upper wall and configured to radiate light toward the inside of the heating chamber ; characterized in that : the heating cooking device further comprises a top panel disposed below the upper wall of the heating chamber , the top panel including a semitransparent member configured to diffuse the light from the first illuminator to illuminate downward, and the top panel including a top panel opening serving as an opening through which the camera images the inside of the heating chamber , wherein the top panel is a flat plate provided parallel to the upper wall with a space between the top panel and the upper wall , wherein, when seeing from a top view, the camera is disposed closer to the front face opening than a center of the upper wall is, and the optical axis is inclined toward a rear side of the heating chamber with respect to a vertical direction. a heating chamber having a front face opening on a front face of the heating chamber , an upper wall disposed on an upper part of the heating chamber , a left-side wall disposed on a left-side part of the heating chamber , a right-side wall disposed on a right-side part of the heating chamber , a back wall disposed on a rear part of the heating chamber and a bottom wall disposed on a lower part of the heating chamber ; a heater configured to heat an object to be heated stored in the heating chamber ; a camera that has an optical axis and is disposed on the upper wall of the heating chamber to face inside of the heating chamber ; and a first illuminator arranged on an upper side of the upper wall and configured to radiate light toward the inside of the heating chamber ; characterized in that : the heating cooking device further comprises a top panel disposed below the upper wall of the heating chamber , the top panel including a semitransparent member configured to diffuse the light from the first illuminator to illuminate downward, and the top panel including a top panel opening serving as an opening through which the camera images the inside of the heating chamber , wherein the top panel is a flat plate provided parallel to the upper wall with a space between the top panel and the upper wall , wherein, when seeing from a top view, the camera is disposed closer to the front face opening than a center of the upper wall is, and the optical axis is inclined toward a rear side of the heating chamber with respect to a vertical direction. the heating cooking device further comprises a top panel disposed below the upper wall of the heating chamber , the top panel including a semitransparent member configured to diffuse the light from the first illuminator to illuminate downward, and the top panel including a top panel opening serving as an opening through which the camera images the inside of the heating chamber , wherein the top panel is a flat plate provided parallel to the upper wall with a space between the top panel and the upper wall , wherein, when seeing from a top view, the camera is disposed closer to the front face opening than a center of the upper wall is, and the optical axis is inclined toward a rear side of the heating chamber with respect to a vertical direction. <EOS>