PROBLEM TO BE SOLVED: To provide a pore water pressure measuring device for repeatable use, soft ground improvement method using the same, a method for determining a dynamic state of a ground for underground installation, and a method for determining a dynamic state of a ground for banking structure installation.SOLUTION: A pore water pressure measuring device comprises a pipe member 21 with the upper end side 21a extending above the ground, a filter part 22 arranged at the open lower end side 21b of the pipe member 21, and a pressure sensor 24 fixed to the upper end side. An air reservoir 23 is formed above the water level of the pore water of the ground flowing into the pipe through the filter part at the upper part side 21a of the pipe member. A pressure receiving part 24a of the pressure sensor 24 is exposed in the air reservoir 23 formed at the upper end side 21a of the pipe member, so as to measure fluctuations of the air pressure in the air reservoir 23 due to rises and falls of the pore water level flowing into the pipe member resulting from fluctuations of the pore water pressure in the ground.
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