We measured the electrical resistivity, specific heat, magnetic susceptibility and high-field magnetization in TbCu2 with the orthorhombic structure. The metamagnetic transtion was found in a wide temperature range of 4.2 to 150 K for the magnetic field along the c-axis. This transition is similar to those of DyCu2 and PrCu2, which are due to the magnetic-axis conversion between easy (a-) and hard (c-) axes in magnetization. The metamagnetic transition was, however, not found in HoCu2 with the same crystal structure and similar magnetic anisotropy.