The present invention provides an X-ray image sensor comprising: a sensor panel which is bendable, generates an electrical signal by detecting an X-ray, and has a first elasticity； a printed circuit board which transmits the electrical signal to the outside, has a second elasticity that is smaller than the first elasticity, and has a flexible property； and an elastic adjustment member which is made of an elastic material having a third elasticity that is larger than the first elasticity, and which adjusts the elasticity of the sensor panel and the printed circuit board so as to be greater than or equal to the third elasticity.
