A column device for liquid chromatography, comprising: a cylindrical column body that holds a column filler; a pair of end caps (105, 106) that cover the column body at both ends thereof, each end cap (105, 106) having a flow hole (111, 112) for a carrier liquid in the center thereof; a pair of columnar joint members (113, 114) including a large external diameter portion (113a, 114a) arranged on one end thereof and a small external diameter portion (113b, 114b) arranged on the other end thereof, in which an end surface on a side of the large external diameter portion (113a, 114a) contacts end surfaces of the pair of end caps (105, 106), each joint member (113, 114) having a communication hole (115, 116) which is arranged in the center of the joint member (113, 114) and agrees with the flow hole (111, 112); a ring-like sealing member (117, 118) arranged so as to surround the flow hole (111, 112) and the communication hole (115, 116) between a contact surface between the end cap (105,106) and the joint member (113, 114); a bottomed cylindrical case that accommodates the pair of end caps (105, 106) and the large external diameter portion (113a, 114a) of the pair of joint members (113, 114) in an engaged state; and a cover member detachably installed on a side of an opening of the case, wherein a bottom of the case includes a through-hole that holds the large external diameter portion of one joint member of the pair of the joint member (113, 114) and allows the small external diameter portion thereof to go through, wherein the cover member includes a through-hole that holds the large external diameter portion of the other joint member of the pair of the joint member (113, 114) and allows the small external diameter portion thereof to go through, wherein the small external diameter portion (113b, 114b) of the pair of joint members (113,114) becomes a joint for a pipe (131, 132) constituting a flow path for the carrier liquid,_ and wherein the joint member (113, 114) includes a mount groove arranged on a surface of contact with the end cap (105, 106) and which holds the ring-like sealing member (117, 118), and thereby the sealing member (117, 118) is held on the side of the joint member (113, 114). a cylindrical column body that holds a column filler; a pair of end caps (105, 106) that cover the column body at both ends thereof, each end cap (105, 106) having a flow hole (111, 112) for a carrier liquid in the center thereof; a pair of columnar joint members (113, 114) including a large external diameter portion (113a, 114a) arranged on one end thereof and a small external diameter portion (113b, 114b) arranged on the other end thereof, in which an end surface on a side of the large external diameter portion (113a, 114a) contacts end surfaces of the pair of end caps (105, 106), each joint member (113, 114) having a communication hole (115, 116) which is arranged in the center of the joint member (113, 114) and agrees with the flow hole (111, 112); a ring-like sealing member (117, 118) arranged so as to surround the flow hole (111, 112) and the communication hole (115, 116) between a contact surface between the end cap (105,106) and the joint member (113, 114); a bottomed cylindrical case that accommodates the pair of end caps (105, 106) and the large external diameter portion (113a, 114a) of the pair of joint members (113, 114) in an engaged state; and a cover member detachably installed on a side of an opening of the case, wherein a bottom of the case includes a through-hole that holds the large external diameter portion of one joint member of the pair of the joint member (113, 114) and allows the small external diameter portion thereof to go through, wherein the cover member includes a through-hole that holds the large external diameter portion of the other joint member of the pair of the joint member (113, 114) and allows the small external diameter portion thereof to go through, wherein the small external diameter portion (113b, 114b) of the pair of joint members (113,114) becomes a joint for a pipe (131, 132) constituting a flow path for the carrier liquid,_ and wherein the joint member (113, 114) includes a mount groove arranged on a surface of contact with the end cap (105, 106) and which holds the ring-like sealing member (117, 118), and thereby the sealing member (117, 118) is held on the side of the joint member (113, 114).