Patent ID: 7554884

Claim:
A detector for fishing comprising: an ultrasonic sensor transmitting an ultrasonic signal into the water in a fishing site and receiving a reflective ultrasonic signal reflected from an underwater object; a control unit analyzing/determining the waveform of the reflective ultrasonic signal measured in the sensor to then be indicated on an indication unit; a switching unit having an elevating rod whose lower end contacts an activation switch to turn on/off electric power supplied from a power source and in the upper end of which a fishing line engagement hole is formed in which a fishing line is connected with the fishing line engagement hole and the elevating rod is exposed to the outside to then be elastically pressed to be opened and closed according to the pressure of the elevating rod; and a detector main body on the upper surface of which the indication unit is formed, and in which the sensor, the control unit, and the switching unit are embedded in a sealed manner with a predetermined structure.