An information input device includes a first detection device, a second detection device, a coupling member, a connecting line, and a protective member. The coupling member includes a fixing portion and a holding portion, and a folding portion. The connecting line includes an intermediate portion connecting the first detection device and the second detection device that detect a position of the writing tool. At least a part of the intermediate portion extends between the first detection device and the second detection device and is arranged to face the folding portion. The protective member includes an arrangement portion whose length is longer than a length of the intermediate portion. An end portion of the protective member is fixed to at least one of the fixing portion and the holding portion. The arrangement portion is disposed between the folding portion and the intermediate portion of the connecting line.