Providing a power generating device that can output higher power as well as downsize the device, and providing a power generating module using the same. The power generating device 1 has a power generating section 20 that includes a piezoelectric body 21; and a plurality of electrode pairs each constituted by a pair of electrodes (22, 23) that are placed on opposite sides of the piezoelectric body 21 with regard to a thickness direction thereof to define a functional section 21a therebetween, each of the functional sections 21a is cooperated with the related electrode pair (22, 23) to define a power generating element 200. A plurality of the power generating elements 200 includes a first power generating element 201 and a second power generating element 202 configured to give a polarization orientation opposite to each other in the thickness direction. The first and second power generating elements (201, 202) are configured to have the corresponding electrodes (22, 22) that are connected to each other by means of a wiring member 24 on the same surface of the piezoelectric body 21 with regard to the thickness direction thereof, such that all of the plurality of the power generating elements 200 are connected in series.