A data reader for reading out data from a memory of a removable member installable in an image forming apparatus, the data reader comprising: a memory board including a memory and provided to a removable member removably installed in a mount of an image forming apparatus; and a reading member provided to the mount and including a reading terminal (32; 33; 34) projecting from a reading member base to read out data from the memory, wherein the memory board further includes a positioning opening, a ground terminal provided to the positioning opening, and a planar contact terminal (42; 43; 44) to contact the reading terminal (32; 33; 34), the contact terminal (42; 43; 44) disposed parallel to the ground terminal, the reading member includes an engagement projection to fit in the positioning opening, the engagement projection disposed adjacent and parallel to the reading terminal (32; 33; 34), the engagement projection includes a uniform diameter portion standing on the reading member base, a tapered portion extending from an end of the uniform diameter portion, and an apparatus-side ground terminal to contact the ground terminal of the memory board when the engagement projection fits in the positioning opening, and the apparatus-side ground terminal projects laterally from the uniform diameter portion in a portion extending from the end of the uniform diameter portion toward the reading member base, characterized in that the apparatus side ground terminal includes an extended portion extending from the end of the uniform diameter portion and covered with the tapered portion of the engagement projection and the engagement projection comprises a containing recess shaped like a slot and formed in the uniform diameter portion and extending into the tapered portion, the containing recess containing and supporting the apparatus-side ground terminal. a memory board including a memory and provided to a removable member removably installed in a mount of an image forming apparatus; and a reading member provided to the mount and including a reading terminal (32; 33; 34) projecting from a reading member base to read out data from the memory, wherein the memory board further includes a positioning opening, a ground terminal provided to the positioning opening, and a planar contact terminal (42; 43; 44) to contact the reading terminal (32; 33; 34), the contact terminal (42; 43; 44) disposed parallel to the ground terminal, the reading member includes an engagement projection to fit in the positioning opening, the engagement projection disposed adjacent and parallel to the reading terminal (32; 33; 34), the engagement projection includes a uniform diameter portion standing on the reading member base, a tapered portion extending from an end of the uniform diameter portion, and an apparatus-side ground terminal to contact the ground terminal of the memory board when the engagement projection fits in the positioning opening, and the apparatus-side ground terminal projects laterally from the uniform diameter portion in a portion extending from the end of the uniform diameter portion toward the reading member base, characterized in that the apparatus side ground terminal includes an extended portion extending from the end of the uniform diameter portion and covered with the tapered portion of the engagement projection and the engagement projection comprises a containing recess shaped like a slot and formed in the uniform diameter portion and extending into the tapered portion, the containing recess containing and supporting the apparatus-side ground terminal.