Provided is an intraesophageal electrostimulator configured so that other medical tools can also be easily inserted into an esophagus and misalignment in the esophagus can be reduced. An intraesophageal electrostimulator 100 includes a stimulator body 101, stimulating electrodes 111, 112, and power feed lines 113, 114. The stimulator body 101 is formed, in order to insert the stimulator body 101 into an esophagus S, in an elongated flat plate shape with flexibility in a longitudinal direction. The stimulator body 101 includes a first flat plate member 102, a second flat plate member 103, and an exterior body 104. On one plate surface of the first flat plate member 102, each of the stimulating electrodes 111, 112 is provided so as to protrude from the plate surface. The second flat plate member 103 overlaps with the other plate surface of the first flat plate member 102 such that the second flat plate member 103 and the first flat plate member 102 sandwich the power feed lines 113, 114. The exterior body 104 covers the first flat plate member 102 and the second flat plate member 103 overlapping with each other.