Illuminated push-button switch device

An illuminated push-button switch device comprising:

• a shell portion enclosing a switch element and a light source and having one or more opening portions protruding from an upper surface of the shell portion;
• a button portion provided to cover the one or more opening portions, the button portion being vertically movable along the one or more opening portions;
• and
• a panel portion surrounding an outside of the button portion and provided on the upper surface of the shell portion,
• wherein a gap is provided between the panel portion and the button portion in a top view,
• wherein the upper surface of the shell portion extends along a plane perpendicular to a vertical movement direction of the button portion, and a slope portion at a predetermined angle with respect to the upper surface is formed on a portion of the upper surface situated under the gap,
• wherein a height of the slope portion along the vertical movement direction gradually decreases from a button portion side to a panel portion side,
• wherein the slope portion is formed in a position that overlaps an entire circumference of an inner edge of the panel portion in a top view, and surrounds the one or more opening portions in a top view, and at least a portion of the slope portion is positioned directly under the gap,
• wherein a lower end of an outer wall of the button portion is provided parallel to the upper surface of the shell portion, and is at a predetermined angle with respect to the slope portion, the lower end facing the slope portion,
• wherein the gap is provided between an outer wall of the button portion and an inner wall of the panel portion facing the outer wall of the button portion,
• wherein a sloping angle of the slope portion with respect to the upper surface is defined as a first angle,
• wherein an angle between a direction of a tangent that comes into contact with the inner wall of the panel portion via a lowermost end of an outer surface of the outer wall of the button portion and a vertical direction perpendicular to the upper surface is defined as a second angle,
• wherein the first angle is greater than or equal to the second angle, and
• wherein a protrusion projecting toward the outer wall of the button portion is formed on the inner wall of the panel portion, and a distal end surface of the protrusion on the inner wall of the panel portion faces the outer surface of the outer wall of the button portion.