| 摘要 |
A passage detection apparatus 300 is configured to detect the change in the properties (propagation state of sound wave, dielectric constant, etc.) of a specific space 300 a, which changes according to the passage of an object in the specific space 300 a and the size of the object. The passage detection apparatus 300 includes a pair of detection units 310 and 320 configured to transmit and receive signals to and from an external device. The specific space 300 a is formed by the space between the detection unit 310 and the detection unit 320 . The detection unit 310 is supported by a first substrate 330 . The detection unit 320 is supported by a second substrate 340 that is parallel to the first substrate 330 , and arranged at the position corresponding to the detection unit 310 supported by the first substrate 330.
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