Vibration power generation device

A vibration power generation device comprising:

• a power generating element configured to be attached to a vibrating member to convert vibration energy of the vibrating member to electrical energy;
• and
• a multiple-degree-of-freedom vibration system comprising a first vibration system in which a first mass member is elastically supported by a first spring member, and a second vibration system in which a second mass member is elastically connected to the first mass member by a second spring member, wherein
• the power generating element is arranged between the first mass member and the second mass member, and relative displacement of the first mass member and the second mass member is caused with vibration being applied from the vibrating member to the first mass member and transmitted to the second mass member so that the vibration energy of the vibrating member is input to the power generating element,
• a natural frequency of the first vibration system is different from a natural frequency of the second vibration system,
• the first mass member has a hollow structure provided with a housing space inside, and the second vibration system is housed within the housing space,
• the second spring member of the second vibration system is formed of a plate spring, and the power generating element is mounted on the plate spring,
• a support part projects within the housing space of the first mass member,
• one end side of the plate spring is attached to the support part and supported within the housing space at a position inward from a peripheral wall of the first mass member, and
• the second mass member is attached to another end side of the plate spring.