Microparticle detection device and security gate

A security gate comprising:

• a separation device that separates fine particles from an object of examination;
• a trap device that traps the separated fine particles;
• a vaporization device that vaporizes the fine particles trapped by the trap device by vaporization or decomposition;
• a first flow passageway, that is downstream of and separate from the vaporization device, in which a mixture of a component vaporized by the vaporization device and a residual component that has not been vaporized by the vaporization device flows;
• a second flow passageway branching from the first flow passageway in a direction of inertial force acting on the residual component, the residual component being introduced into the second flow passageway;
• a third flow passageway branching from the first flow passageway in a direction different from the direction of the inertial force, the vaporized component being introduced into the third flow passageway;
• an analysis device that analyzes a component introduced into the third flow passageway;
• and
• a control device that controls opening or closing of a gate based on a result of analysis by the analysis device, wherein
• the vaporization device is a light reflecting vaporization device.