To accurately measure the depth or temperature of water at a place where people cannot easily approach by incorporating a water-pressure measuring means, a water temperature measuring means, an A/D converter, a memory, a data transmission means, or the like in one piece for constituting a device.

In the measuring device, a water pressure meter 10 as a water- pressure measuring means, a water temperature meter 20 as a water temperature measuring means, an A/D converter 30, a memory 40, a data transmission means 50, and a battery 60 for a power supply are incorporated in one piece. The depth of the measuring device is obtained according to water pressure obtained by the water pressure meter 10. The A/D converter 30 prepares digital data based on the analog output signal of the water pressure meter 10 and the water temperature meter 20. The memory 40 stores the digital data being created by the A/D converter 30 and digital data such as time regarding measurement. The data transmission means 50 is for allowing the data stored in the memory 40 to be read into an external equipment arranged on the ground, and is constituted of an electronic circuit where an electromagnetic wave, an ultrasonic wave, infrared rays, visible light, or the like are used as media.