A printing jig comprising: bases to be fitted to a printing apparatus; a first holder able to hold one or more first substrates and fittable to each of the bases; and a second holder able to hold one or more second substrates different in size from the first substrate or substrates and fittable to each of the bases; wherein the first holder includes a first fitting portion to be fitted to each of the bases; the second holder includes a second fitting portion to be fitted to each of the bases; each of the bases is structured such that the first fitting portion and the second fitting portion are both fittable thereto; the first holder includes: a first docking plate including the first fitting portion; and one or more first substrate holders to be fitted to the first docking plate to hold the first substrate or substrates; the second holder includes: a second docking plate including the second fitting portion, the second docking plate being different from the first docking plate; and one or more second substrate holders to be fitted to the second docking plate to hold the second substrate or substrates, the one or more second substrate holders being different from the first substrate holders. bases to be fitted to a printing apparatus; a first holder able to hold one or more first substrates and fittable to each of the bases; and a second holder able to hold one or more second substrates different in size from the first substrate or substrates and fittable to each of the bases; wherein the first holder includes a first fitting portion to be fitted to each of the bases; the second holder includes a second fitting portion to be fitted to each of the bases; each of the bases is structured such that the first fitting portion and the second fitting portion are both fittable thereto; the first holder includes: a first docking plate including the first fitting portion; and one or more first substrate holders to be fitted to the first docking plate to hold the first substrate or substrates; the second holder includes: a second docking plate including the second fitting portion, the second docking plate being different from the first docking plate; and one or more second substrate holders to be fitted to the second docking plate to hold the second substrate or substrates, the one or more second substrate holders being different from the first substrate holders. a first docking plate including the first fitting portion; and one or more first substrate holders to be fitted to the first docking plate to hold the first substrate or substrates; the second holder includes: a second docking plate including the second fitting portion, the second docking plate being different from the first docking plate; and one or more second substrate holders to be fitted to the second docking plate to hold the second substrate or substrates, the one or more second substrate holders being different from the first substrate holders. a second docking plate including the second fitting portion, the second docking plate being different from the first docking plate; and one or more second substrate holders to be fitted to the second docking plate to hold the second substrate or substrates, the one or more second substrate holders being different from the first substrate holders.