Near-infrared transmissive covers and near-infrared sensor

A near-infrared sensor, comprising:

• an emitting unit that is configured to transmit near-infrared rays to an outside of a vehicle while changing an emission direction within a predetermined angular range;
• a receiving unit that is configured to receive the near-infrared rays that have struck and been reflected by an object of the outside;
• a case including an open front end in the emission direction and that incorporates the emitting unit and the receiving unit;
• and
• a near-infrared transmissive cover that covers the emitting unit and the receiving unit from a front in the emission direction, wherein
• the near-infrared transmissive cover includes:
• a peripheral wall that is arranged in front of the case in the emission direction and has an annular cross-sectional shape;
• and
• a cover body that is formed at a front end of the peripheral wall in the emission direction and has transmissiveness to the near-infrared rays,
• a framework of the cover body includes a base including a plate-shaped base body,
• the cover body includes:
• the base body;
• a decorative layer that protrudes forward or rearward in the emission direction from the base body;
• a coating layer that is laminated onto the base body so as to cover the decorative layer;
• and
• a reflection suppression portion located at a rearmost part in the emission direction of the cover body, the reflection suppression portion suppressing reflection of the near-infrared rays emitted from the emitting unit,
• the decorative layer is formed by a part of the base or a member different from the base,
• the decorative layer and the coating layer are respectively made of plastic materials having a difference in refractive index of less than or equal to 0.03,
• the reflection suppression portion is formed by a first reflection suppression portion in a region of the cover body in which an angle of incidence of the near-infrared rays emitted from the emitting unit is less than 40°, and
• the reflection suppression portion is formed by a second reflection suppression portion in a region of the cover body in which the angle of incidence is greater than or equal to 40°, the second reflection suppression portion suppressing reflection of a greater amount of the near-infrared rays than the first reflection suppression portion does.