1. An image capturing device, comprising: an optical system configured to focus lights from an object to generate optical information; a first filter provided near a diaphragm position of the optical system, the first filter including a plurality of filters respectively having different spectral characteristics; a sensor configured to convert the optical information of the object to electronic data and provided with a second filter, the second filter including a plurality of filters respectively having different spectral characteristics, which are different than the spectral characteristics of the first filter; and a lens array provided between the optical system and the sensor and configured to have a plurality of lenses being arranged in substantially parallel in a direction of a two-dimensional surface of the sensor, wherein the lights from the object pass through the respective filters of the first sensor and the respective filters of the second sensor to simultaneously form a plurality of types of spectral image of the object on an image plane of the sensor.