Power transmission device, wireless power transmission system, and information communication system

A power transmission device that wirelessly transmits power to a vehicle provided with a power receiving function, the power transmission device comprising:

• a power transmitter that includes a power transmission coil and that transmits power to the vehicle via the power transmission coil;
• a detector that includes a function for detecting a foreign object present in a detection target region;
• a position information acquirer that acquires a position of the vehicle;
• an instruction receiver that receives an instruction about power transmission to the vehicle;
• and
• an information emitter that
• in a case in which the position of the vehicle acquired by the information acquirer is located in a power transmission range of the power transmission coil and, also, the instruction receiver receives the instruction about power transmission, emits a first type of information that indicates a presence of the foreign object when the detector detects the foreign object, and
• in a case in which the instruction receiver does not receive the instruction about power transmission even though the position of the vehicle acquired by the position information acquirer is located in the power transmission range of the power transmission coil, does not emit the information that indicates the presence of the foreign object.