An article carrying robot (1, 1a) comprising: a bottom portion including a traveling portion; a body portion (2, 2a) including a first pillar portion (21, 25) and a second pillar portion (22, 26) each extending in a vertical direction from one end and another end in a horizontal direction of the bottom portion, and a top portion including one end connected to an end of the first pillar portion (21, 25) that is opposite to the bottom portion and including another end connected to an end of the second pillar portion (22, 26) that is opposite to the bottom portion; an article storage portion (11, 11a) that forms an opening with the first pillar portion (21, 25), the second pillar portion (22, 26), the top portion, and the bottom portion in such a way that the opening penetrates the body portion (2, 2a); fixing portions provided in the first and second pillar portions to sandwich the opening and pair up with each other, for fixing an article storage auxiliary instrument; and wiring (13, 13a) provided inside the first and second pillar portions, for passing electric power and a control signal therethrough; a terminal (14, 14a) provided in the first pillar portion (21, 25), the second pillar portion (22, 26), the top portion, or an upper surface of the traveling portion, the terminal (14, 14a) being connected to the wiring a drive controlling device for performing driving control of the article carrying robot (1, 1a); and a tag reader for reading information on an article from a tag that is attached to the article and includes the information in advance, the tag reader being electrically connected through the wiring (13, 13a), wherein when the article storage auxiliary instrument (6, 6d) is fixed to the fixing portions, the terminal (14, 14a) is connected to an auxiliary instrument side terminal provided in the article storage auxiliary instrument (6, 6d), and the wiring and an auxiliary instrument side wiring provided in the article storage auxiliary instrument (6, 6d) are connected, wherein the tag reader is fixed in the opening with the fixing portions and faces the article storage auxiliary instrument detachably fixed in the opening, or the tag reader is provided on inside a part of the article storage auxiliary instrument, the part serving as an opening portion for articles via which the article is put in or out, and when the wiring (13, 13a) and the auxiliary instrument side wiring are electrically connected as a result of a connection between the terminal (14, 14a) and the auxiliary instrument side terminal of the article storage auxiliary instrument (6,6d), the drive controlling device controls the tag reader and causes the tag reader to read the information on the article from the tag via the auxiliary instrument side wiring. a bottom portion including a traveling portion; a body portion (2, 2a) including a first pillar portion (21, 25) and a second pillar portion (22, 26) each extending in a vertical direction from one end and another end in a horizontal direction of the bottom portion, and a top portion including one end connected to an end of the first pillar portion (21, 25) that is opposite to the bottom portion and including another end connected to an end of the second pillar portion (22, 26) that is opposite to the bottom portion; an article storage portion (11, 11a) that forms an opening with the first pillar portion (21, 25), the second pillar portion (22, 26), the top portion, and the bottom portion in such a way that the opening penetrates the body portion (2, 2a); fixing portions provided in the first and second pillar portions to sandwich the opening and pair up with each other, for fixing an article storage auxiliary instrument; and wiring (13, 13a) provided inside the first and second pillar portions, for passing electric power and a control signal therethrough; a terminal (14, 14a) provided in the first pillar portion (21, 25), the second pillar portion (22, 26), the top portion, or an upper surface of the traveling portion, the terminal (14, 14a) being connected to the wiring a drive controlling device for performing driving control of the article carrying robot (1, 1a); and a tag reader for reading information on an article from a tag that is attached to the article and includes the information in advance, the tag reader being electrically connected through the wiring (13, 13a), wherein when the article storage auxiliary instrument (6, 6d) is fixed to the fixing portions, the terminal (14, 14a) is connected to an auxiliary instrument side terminal provided in the article storage auxiliary instrument (6, 6d), and the wiring and an auxiliary instrument side wiring provided in the article storage auxiliary instrument (6, 6d) are connected, wherein the tag reader is fixed in the opening with the fixing portions and faces the article storage auxiliary instrument detachably fixed in the opening, or the tag reader is provided on inside a part of the article storage auxiliary instrument, the part serving as an opening portion for articles via which the article is put in or out, and when the wiring (13, 13a) and the auxiliary instrument side wiring are electrically connected as a result of a connection between the terminal (14, 14a) and the auxiliary instrument side terminal of the article storage auxiliary instrument (6,6d), the drive controlling device controls the tag reader and causes the tag reader to read the information on the article from the tag via the auxiliary instrument side wiring.