A feeding amount correction method of an endless conveyance belt in an inkjet recording apparatus that jets an ink droplet to a recording medium from an inkjet head while conveying the recording medium supported on the conveyance belt by feeding the conveyance belt for conducting printing, the feeding amount correction method comprising the steps of: (a) printing test dots of an amount equivalent to one round of the conveyance belt at a pitch of a prescribed feeding amount, from an origin on the recording medium to be established when a starting point arranged on the conveyance belt is detected, while causing the conveyance belt to convey the recording medium in a feeding direction of the conveyance belt at the pitch of the prescribed feeding amount; (b) measuring a conveyance amount that measures a printing space between the test dots printed in the step of printing test dots; (c) correcting a feeding amount of the conveyance belt to a corrected feeding amount corresponding to a feeding position of the conveyance belt, based on the measuring results in the measuring step; and (d) conducting an ordinary printing on the recording medium, while feeding the conveyance belt according to the corrected feeding amount that has been corrected in the correcting step, wherein the conveyance belt has a spliced portion when forming the conveyance belt in an endless form, and is trained about plural rollers (32, 33), the method further comprising: detecting the starting point of the conveyance belt when the spliced portion of the conveyance belt is located in the vicinity of the rollers (32, 33) and upstream of the rollers (32, 33) in the feeding direction, and the step of printing test dots comprises establishing the position of the recording medium where the test dots are printed as the origin, when the starting point of the conveyance belt is detected. (a) printing test dots of an amount equivalent to one round of the conveyance belt at a pitch of a prescribed feeding amount, from an origin on the recording medium to be established when a starting point arranged on the conveyance belt is detected, while causing the conveyance belt to convey the recording medium in a feeding direction of the conveyance belt at the pitch of the prescribed feeding amount; (b) measuring a conveyance amount that measures a printing space between the test dots printed in the step of printing test dots; (c) correcting a feeding amount of the conveyance belt to a corrected feeding amount corresponding to a feeding position of the conveyance belt, based on the measuring results in the measuring step; and (d) conducting an ordinary printing on the recording medium, while feeding the conveyance belt according to the corrected feeding amount that has been corrected in the correcting step, detecting the starting point of the conveyance belt when the spliced portion of the conveyance belt is located in the vicinity of the rollers (32, 33) and upstream of the rollers (32, 33) in the feeding direction, and the step of printing test dots comprises establishing the position of the recording medium where the test dots are printed as the origin, when the starting point of the conveyance belt is detected.