1. An image-capturing apparatus for capturing an image using a solid-state image-capturing device, the image-capturing apparatus comprising: a face detector configured to detect a face of a human being based on an image signal in a period until an image signal obtained by image capturing is recorded on a recording medium; an expression evaluation section configured to evaluate the expression of the detected face and to compute an expression evaluation value indicating the degree to which the detected face is closer to a specific expression than to expressions other than the specific expression; and wherein the expression evaluation section has pre-stored therein information on a determination axis obtained by performing linear discriminant analysis based on a group of sample images of faces each corresponding to one of the specific expression and expressions other than the specific expression, and computes the expression evaluation value based on the magnitude of projection components of a vector based on an image signal of the face detected by the face detector with respect to a vector on the determination axis, and the determination axis is computed based on data such that data of a vector based on the sample images is dimension-compressed by principal component analysis whereas the magnitude of projection components of a vector based on an image signal is computed without performing principal component analysis.