1. A speech recognition apparatus comprising: a recognition device that recognizes a content of a voice made by a user and generates a speech character string as a character string indicative of a recognition result; a display device that displays the speech character string generated by the recognition device; a reception device that receives an input of a correction character string, which is used for correction of the speech character string displayed in the display device, through an operation portion operated by the user under a condition that a part of a body of the user contacts the operation portion; a correction device that corrects the speech character string with using the correction character string, the input of which is received by the reception device; and a detection device that detects a misrecognition character string, which is a character string different from the content of the voice made by the user, in a predetermined correction range of the speech character string, wherein: the correction device executes correction by replacing the misrecognition character string detected by the detection device with the correction character string, the input of which is received by the reception device, the reception device receives the input of the correction range via the operation portion, the detection device detects the misrecognition character string in the correction range of the speech character string, the operation portion includes an operation surface having a plate shape, the operation portion is attached to a steering wheel of a vehicle, and the reception device receives the input of the correction character string by detecting a letter input by a swiping operation of the operation surface of the operation portion.
8. The speech recognition apparatus according to claim 1 , further comprising: a memory device that stores the misrecognition character string relating to the correction executed by the correction device and the correction character string, with which the misrecognition character string is replaced, as a correction record, wherein: the correction device executes the correction by replacing the misrecognition character string with the correction character string stored as replacement of the misrecognition character string in the correction record when the speech character string includes the misrecognition character string stored as the correction record.