An attachment assistance tool for an electronic component configured to be interposed between an electronic component attached to a terminal block and the terminal block, the attachment assistance tool comprising: a base portion configured to be arranged outside a housing of the terminal block such that a rear surface thereof abuts against a front wall of the housing and a part thereof faces a first through hole of the terminal block and a second through hole of the terminal block; a first insertion portion protruding from the rear surface of the base portion to be thereby inserted into the first through hole of the terminal block; and a second insertion portion protruding from the rear surface of the base portion to be thereby inserted into the second through hole of the terminal block, wherein a hollow first passage portion through which a first lead of the electronic component is to be inserted is provided to extend from the base portion to the first insertion portion , a hollow second passage portion through which a second lead of the electronic component is to be inserted is provided to extend from the base portion to the second insertion portion , and a receiving portion configured to receive and accommodate at least a rear portion of a component body of the electronic component is provided at a front-side position of the base portion , characterized in that : the receiving portion is located at least between the first passage portion and the second passage portion , the base portion has a pair of erected wall portions that face each other in a direction orthogonal to a direction connecting the first passage portion and the second passage portion , when viewed from a front side, and the receiving portion is defined by the pair of erected wall portions . a base portion configured to be arranged outside a housing of the terminal block such that a rear surface thereof abuts against a front wall of the housing and a part thereof faces a first through hole of the terminal block and a second through hole of the terminal block; a first insertion portion protruding from the rear surface of the base portion to be thereby inserted into the first through hole of the terminal block; and a second insertion portion protruding from the rear surface of the base portion to be thereby inserted into the second through hole of the terminal block, wherein a hollow first passage portion through which a first lead of the electronic component is to be inserted is provided to extend from the base portion to the first insertion portion , a hollow second passage portion through which a second lead of the electronic component is to be inserted is provided to extend from the base portion to the second insertion portion , and a receiving portion configured to receive and accommodate at least a rear portion of a component body of the electronic component is provided at a front-side position of the base portion , characterized in that : the receiving portion is located at least between the first passage portion and the second passage portion , the base portion has a pair of erected wall portions that face each other in a direction orthogonal to a direction connecting the first passage portion and the second passage portion , when viewed from a front side, and the receiving portion is defined by the pair of erected wall portions . the receiving portion is located at least between the first passage portion and the second passage portion , the base portion has a pair of erected wall portions that face each other in a direction orthogonal to a direction connecting the first passage portion and the second passage portion , when viewed from a front side, and the receiving portion is defined by the pair of erected wall portions . <EOS>