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 (106a, 106b) 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 (106a, 106b) 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.