1. A multi-eye imaging apparatus comprising: a plurality of imaging systems including a first imaging system and a second imaging system, each imaging system including an optical system and an imaging element and having a different optical axis, wherein the first imaging system includes a shifter that moves at least one part of the first imaging system in a fixed amount to change a relative positional relationship between an image formed on the imaging element of the first imaging system and the imaging element of the first imaging system, during a time-series image capture, and a relative positional relationship among parts of the second imaging system is fixed during the time-series image capture; an image memory that accumulates a plurality of frames of image information captured in the time series from the first and second imaging systems; a shake amount obtaining unit that obtains a shake amount by comparing the plurality of frames of image information in the image memory, captured in the time series by from the second imaging system, wherein the shifter moves at least one part of the first imaging system in the fixed amount independent of the shake amount; a parallax amount obtaining unit that obtains a magnitude of a parallax from images in the image memory, captured by the first and second imaging systems, an optimal image selecting unit that selects a combination of image information from the plurality of frames of image information in the image memory, captured in the time series from the first imaging system and the second imaging system, so that a resolution of a combined image information is higher than that of each of the plurality of frames of image information, the selected combination of image information based on the fixed amount for the shifter, the shake amount obtained by the shake amount obtaining unit, and the parallax amount obtained b the parallax obtaining unit; and an image combining unit configured to combine the selected combination of image information.